In today's modern teenage society, we have pretty much dumped racism and just discriminate against anything else.
Mind you, I'm 16, and while it probably won't have a permanent affect on me, it seems quite important now.
In today's teen society, it is very dangerous to go out of your click, circle of friends, or whatever. I have my first gf, and while we basically share the same social type, we (originally) had no friends in common, and nobody really expected either of us to get someone.
After we got together, there are the most insensitive people who'd go "What do you see in her". "Whyd you settle for something like that" and so on.
Racism is only race, but I believe my generation gets to redefine it. Of course, racism isn't politically correct, but harassing people of the same race, no lawyer, judge, teacher, or principal gives a damn.
On the actual subject:
We all have preferences. While it probably isn't racist to say "I probably wouldn't go out with a black girl/guy", it probably is to say "I'd NEVER..."