Look up their definition for "white people". It is immensely negative and hateful. "White people are the most hated race of human beings."
Look up their definition for any other race and you will find it's nowhere as bad.
Hate sites like this should not get a pass.
It's funny. I laugh at most definitions. A lot of the definitions are sexual in nature. People can be offended by some of the definitions here. Some other definitions poke fun/discrimination of sexual orientation, race, gender, national origin, or political views. Kids should not visit here.
Urban Dictionary is a website that is dedicated to the use and definition of slang terms and colloquialisms. Be warned that mature slang terms are not filtered or censored and will be shown. Safe site.