Most Helpful Guy
Most people are attracted to their own race or are just generally unattracted to others. I'm white/hispanic so I tend to be attracted to white and hispanic girls. I find some women from other ethnicities ok looking but am generally not attracted to them. Everyone has their preferences. Nobody is right or wrong in these cases.
Most Helpful Girl
They've got a racist mindset. If they said something different like "I'm usually not attracted to black girls" then they just aren't attracted but it's a cycle in history. Some people have it in their heads that another race is inferior to theirs. They may not think they're racist or admit it but it's a subliminal thought process with some people.