It's not racist. It's just preference.
I for one, am mostly attracted to guys with blue, green, or chocolatey hazel eyes. Blue and green are more common on guys that are white, so that pretty much comes into factor. I like lighter skinned black guys more than the darker skinned...if a dark-skinned black guy is REALLY buff and isn't a douchebag that would make him hot to me. It would also be damn hot if a black guy had Rihanna eyes (there's a dude at my school with those eyes, and oh hell yes they're hot).
Latino guys really just depend on the personality. Of course, if they have hot blue eyes and have some hot tattoos, I'll go for it. There's also another guy I know at my school who is half white and half Latino, and he looks mostly white but his eyes are hazel and they're ****ing gorgeous (for a freshman, I'm 18 so I really can't say that

)
Asian guys well...honestly they all look the same to me. Asian girls are pretty and beautiful, but I find almost no interest in Asian guys. Black girls and latino girls tend to be prettier too.
Though, the main thing I get attracted to is blue-eyed brown haired guys.
Definitely not racist, it's just your preferences which is hard to control.