I think we've all heard this as well (and
BGWLH has a pretty cool perspective on it).
Personal experience, I believe that black men prefer straight hair more so than white men. My stepmother has some gorgeous locks, and I know for a fact that my father absolutely cannot stand them. He likes women with
long straight hair. Most black men I know seem to share the same sentiments. It's incredibly depressing.
Now, the majority of white men I know have their preferences, but they tend to be more
liberal, if that makes sense.