No, I have not. Leave that kind of behavior for those who choose to dwell at the bottom of the human cesspool.

No, I hate people from all backgrounds. No, seriously, I have friends who are White, Asian, Black, Middle Eastern, Hispanic… I don't have a lot of close friends, but my best friend is South Korean. Prejudice is learned. I remember when I was a very young child attending a company picnic where my father worked and there was a little girl about my age with dark skin (probably the first Black person I'd ever seen in person, because I live in one of the whitest places in the state) and I, of course, noticed the difference but didn't otherwise think anything of it. It was just a meaningless difference, and we spent the rest of the day playing together. I feel rather sad for people who get hung up on ethnicity or socioeconomic background or skin color or any other superficial difference; they're depriving themselves from knowing some wonderful people.

No.

I trained as a scientist and we know the human race has only half (sort of) the genetic variety chimpanzees have and we have too little diversity, not too much.

There is actually only one human race, empire builders invented the nonsense.

No. The less you think about racism and the more you look at them as a human being with skills, hope, aspirations, petty imperfections, the more you treat them fairly?

No. When I reject a person it is either due to some aspect of his or her behavior which I find repulsive and/or to his or her personality (for the same reason). Those attributes which I would find repulsive are the same for people of all races and ethnicities.

"Have you rejected someone solely based on their racial or ethnic identity???".

No, because I am not a dick

Well I did meet an 82 year old Caucasian woman at the dentist office, today. After a long conversation she let me know that she loves the Blacks. Because we give good black hugs. She brought up race, not me. As I left the dentist office I asked her for a hug. She let me know, "Now that's a good black hug." She did not reject me but she made it a point to come and talk to the only "black" in the dentist office. I wasn't reject, but picked out.