Or maybe Cornwallis?
The point being that Lafayette was on our side, fighting for the Revolution, but this random dad was teaching his kids that Lafayette was the enemy. So, yeah, the fact that the French played a big part in helping the colonists beat the British is possibly not as well remembered as it should be.
Alas, I could not think of a graceful way to correct him with embarrassing him in front of his kids, which I suspect would not go over well, so I had to bite my tongue and vent on the internet years later.