Conversation at a London Museum

This happened a few years ago, but hard to forget.

MAN (about 65, dressed in a suit, smiles when he speaks): Where are you from?

ME (working at the museum at the time): Budapest. But I learned English in the States.

MAN: You don't learn English in the States. There you learn American.

ME (short pause): Well, they taught me enough English to be able to communicate with people in Britain.

MAN: (long pause)