Some people will pick on or laugh at anyone and make a reason to do so.
I am white, and recognize that there are many different - gee, how would you describe it...... features !! that might suggest a heritage from say, Great Britain, Germany, Portugal or? or? or? but that does not mean they are from there.
Like wise, I think, with Black people, there is a huge variety of features as well, different body shapes - just like White people and so on, but really it is all genetics don't you think?
I live in Barbados and there are a lot of different looking White and Black people. But we all get along.
So I go back to the sad fact that some people just seem to enjoy making other people uncomfortable. The rest of us need to just ignore them.