I think its preferences against groups that is slightly odd and I have an issue with
Of course there are types of people you'll be attracted to, but thats just an ideal right?!- Few of the guys i've gone out with, or even got with, matched my preferences. But if I was to have a preference against Asian guys, then this would affect me in a more direct way. I assume I would actively avoid getting with them- which I think is totally ridiculous.
Also I think sometimes preferences (for and against) are mixed up in racial stereotypes- and this really bugs me.