I haven't seen these here but for regular dating sights:

• white guys throwing "gang" signs
• hats with a straight bill, especially if it's off to the side
• conservatives
• guys who say they aren't interested in fat women (or any variation of that)
• bathroom pics with a toilet in the background or a filthy mirror
• Shirtless pics where they're trying to nonchalantly flex
• guys making kissy faces or with their tongue out
• only having pictures wearing camo and with dead animals. I don't care if you hunt and fish but please have other interests as well

Any dic pic
Shirtless pic
Pic with fish
Not a cat person
Hate bugs
Cadaver consumers
Trump support
Tobacco use
Spawn
Low credit score
Bigots
Serial killer
Trucks
Dirty finger nails
Unkempted beard
Prison pics
Atv pics
Anti cannabis
Anti Israel
Sheeeesh. No wonder I can't get a date.

Anything spiritual.
Not liking animals, especially cats.
Conservative ideology.
Long distance
Children still at home or wanting more children
Major sports fan
Married or very recently divorced or widowed
Gun/weapon aficionado
Car/vehicle nut - seriously more than one car?
Misogyny, racism, or any intolerance of any minority group.

Specifically requesting a certain body type
Supporting Trump
Supporting keeping cannabis illegal
Eats bunnies...

All of these are off-putting for me too. As is any indication of not liking cats.

Trump, conservative, religious nuts (I don't think I need to explain this one, unless your one of the 3)
Lack of profile picture (why all the mystery)
Profile picture of subject naked (if any were worth looking at maybe...generally, their just not that great)
An obviously unflattering profile picture where no attempt was made to look presentable (arrogance)
Wine snob (pffft)
Weed smoker (pfft.)
'romantic walks on the beach' type stuff. (ew)
Sports team mega fan (It's fucking corporate)
The super athlete (again....pfft)
Too much emphasis placed on sexual side of things. (quality not quantity every time)

Any religious beliefs, conservative or even worse, reactionary, support Cheeto Benito, inane comments and/or questions, all of which are immediate nikogda (never).

A guy contacted me, I looked at his profile and found there a Pro-Trump, anti-socialist rant. I politely wrote him back "Thanks for contacting me, I don't think we are going to be compatible, and good luck to you" and he wrote back

"Crap, Your(sic) a liberal Turd" ...

I thought to myself .... What kind of people are these?

Name-calling? How immature, uncivil and totally uncalled for!

A person that post a picture that is of when they are 47 years-old, when on their age it says they are 60. That seems to be foreshadowing about their honesty. My favorite of all is not their post, but when you plan to meet and they tell you that they are married and living with their wife. I have seen hook-up's only, (why are they on here bugging atheist women, they can use Tinder). For me not any statement abut not liking dogs screams "No," in my head. There are men that come on here trolling for women that have, Do you believe in God? with a response of 100%. I chased one off 2 days ago.

Photos 100% in bars, with grandkids, with groups of other women, and/or obviously 10+years old.
Digitally-retouched or studio photos. Honest photos are vital.
"God comes first, you second" (will god be involved in our sex?).
Support for Trump, or Conservatism in general.

Cutesy Instagram filters. Ugh.
A profile that consists of a solid slab of 200+ words with no punctuation.

Republican, Trump fan, religious........

If a guy's profile talks about how much he loves working out, has gym pics, and says he's looking for someone "in shape," who " takes care of herself," I assume this is code for "no higher than 8% body fat."

"kids still at home" is probably the biggest nope for me.

Someone who lives politics, smoking, if they don`t like animals or kids, religious practitioners, drugs, closed-mindedness picking on people for their political ideas.

And people wonder why they are still single.
At least I admit that I'll be a bachelor the rest of my life and have no real chance of any relationship.
I don't find overweight women attractive for the same reason I don't like the way liver tastes. It just is.
I am attracted to long, wavy, curly hair more than straight hair. I suppose that makes me a cretin too some as well.
The thing is, I don't care what you think of me, I don't have anything invested except a few words on website. If you don't like me, that's fine, block me. If you do like me that's fine as well.
Let's just all be honest and stop tip-toeing around political correctness because you might hurt one's feelings. Life happens and these things happen also. Utopia does not exist.

A guy hit me up on Match whose profile stated he was looking for a "feminine, submissive woman" who shouldn't "show up without makeup" and that he didn't date outside his race.
ALL the nopes!!!!!

When all the pictures have multiple people in them, I assume you’re the least attractive one.

Reading their comments. Rude, offensive, attacking people? Hell nope!!

Distance
MAGA
5 cats in the background of the profile pic
Religious/Believer/Spiritual
Open relationship/separated/married
It’s a dude (just because I’m not homophobic doesn’t mean I’m interested)
Gun pics
Terrible grammar
Hasn’t happened yet, but if I ever find a Flat Earther’s profile here... definitely on the nope list.

My profile says, “I’m here for community”... that makes me not good for dating:

We have exactly the same set of standards with the exception that I also require a female for dating. - - not that I ever expect to find such a person on this site. Geographically I live in an a massive abyss blackened by faith of the delusional theists. Yes, I live in a tRumplican state.

Anyone who rejects the love of JESUS CHRIST Our Savior and GOD Our Father!

I do very poorly here.

I concur with most of your reasoning. The biggest one for me, would be complacency. If someone, through their posts, shows an inability to alter their world views when confronted with new ideas, that's the no go for me. Cognitive dissonance is frankly disgusting IMO.

Reading what a person has posted is the best research to learn who they might actually be. Difficult to hide one's stupidity for long.

I would prefer more questions, sorta like OKCupid. But the free form conversations here are most useful.