I'm a black guy and I've only had reactions similar to that chatting online, not in person. But only a very few people have had an opportunity to react to my penis in person. Some people buy into the myth that black guys are supposed to be huge so even if you are big, you might be smaller than they "expect. " Anybody stupid enough to reject you or question your ethnicity (unbelievably rude) because you're big but not double digits, is an idiot and not worthy of you or your cock.