He was wrong anyway. It's your MOM who is what's wrong with America.

You're what's wrong with America! No you are! Noooo you are!.... The two white people at the bar continue the argument as a dark skinned bus boy removes their half eaten avocado and toast tapas dish. Walking away he thinks to himself, "Gosh, being what's wrong with America seems nice."

Maybe you should rethink what a "private conversation" loudly spoken at a crowded bar means. You may have been speaking in confidence, but when you choose to do that within earshot of several other people, be aware of your surroundings. What you deem as private between friends might come across as very offensive to others.