I wish I was like my dog, he doesn't see color or appearance, he sees people.
Racism will probably be with us for a long, long time until we willfully extinguish it from the majority. Racism will persist though, I don't think we will be able to exterminate it completely from each and every culture. Until we can eliminate need and want there will always be those who seek someone to blame, someone to hate as the perceived source of discontent.
I hope I am proven wrong but I fear I won't be.
Now your question : You CAN be racist against white people but is it OK?
No it's not OK, I think it is more tolerated by the general population, it's still not OK to be a racist in my book.
The other questions reek of racism, they seem to be searching for something to validate the racist views held by themselves.
This is just my opinion of course, for whatever it's worth.