Oh he's very nice. He's so intelligent and always happy and smiling, and very professional. He's black, you know.
Are you implying that you're surprised that he has those qualities because he's black? I hope not.
I just didn't expect him to be so polite and well spoken!
Making judgments of someone based on their race is wrong and harmful. Instead of assuming things about someone based on the color of their skin, you should get to know them on an individual level.
I don't want to do that. They are too dangerous.
Saying that black people are dangerous is a very harmful stereotype. When people say things like that, it perpetuates racism and violence toward black people. How would you feel if someone assumed you were a violent person because of the color of your skin?