Why do White guys pick on Black girls (can I get a real answer please)?

They're just saying what's on their mind. Just like how I've seen black people post hateful sh!t about white people on here. Both are just being stupid and saying what's on their mind. And where a better place to say that then on the internet. Because in real life if they said half the **** they say on here they would either get knocked out or arrested (this goes for all colors of trolls).