I essentially rejected a black woman because she didn't belong to my culture
Why did you reject a black person?
I didn't like her look and the way she pronounced English.
If you don't want to date someone you should not be forced to. It seems racist to point out everything you don't like  belonging to one group of people.
I am not a white supremacist I just didn't like her.
It is wrong to judge people based off stereotypes. You should respectfully decline her advances if you simply are not attracted to her.