From your quote I wouldn't say that you're a racist necessarily, but it DOES sound racist, surely you can see that? Maybe you didn't mean it.
"Those black people."
Bullshit, it's a plural pronoun. Pass me
those nachos.
Those women have big tits. Lookout Debussey,
those aliens have a probe.
Or does it only sound racist because
those black people are waaaaay over there? If we move them closer we can call them
these black people instead. Better?
The racism here is all in your head. Just because you envision someone sneering while using the word 'those' does not make it so. If you're going to police everyone into tapdancing around harmless words and ensuring they're all walking on eggshells for you, then you're not going to have much time for anything else.
Ps - Kyomu, I don't know why he's so upset with you. You're not even Korean, you dirty Jap.