Yes, racism often comes naturaly, but you're not going to grow socially(not be racist) if you avoid mingling with people of an undesired ethnicity.
Much like a person who is afraid of the sea can't lose that fear without first learning how to swim. Instead of indulging your prejudices, you'll be a better member of society if you learn how not to be a racist, for the good of everyone. And this IS possible to achieve.
It is, and I guess most people do so. I do have prejudices myself (as you would have guessed, otherwise I wouldn't defend them so stubbornly
), but still I have good friends who are part of the ethnicities I dislike. They can be my friends because I estimate them as exceptions of my prejudices, which on the other hand get confirmed regularly (=> prejudices by personal experience, I am not brainwashed by media or my parents or the like. Definitely not
). That's the problem with prejudices and why they sustain.
I think having prejudices is okay, but it's still better if you try to evaluate every person for himself while having general prejudices, that's at least what I try. I hope this makes me appear a little less as asshole now.
But actually we are derailing the topic. Or I am. It's about what to do with those racist trolls.
My suggestion: allow it and then ignore it. Trolling needs attention to work. No attention, no trolling. If you happen to have someone who really tries to preach over chat, the missing attention will soon make him stop by himself and look for another place, because preaching needs attention as well. You can see it very well in the case of Kevin_Flynn, who perfectly feeds Sir_Donkey.