Well, I'll start by saying I'm one of those french Québecois. And AJ here is right, assholes comes from everywhere. In their defense, I'll say that there is pretty much a "Quebecer Village" in Florida and sometimes you figure there's chance you might be able to order in french but clearly those two were just assholes. I also have a pretty similar story (well I have a lot more than one involving americans).
The town I grew up in is somewhat famous for successful fishing and hunting expeditions and we had people coming from around the world for these activities everywhere. Not that many, but enough to notice in such a small town. Needless to say, we get a few Americans each year. In that particular story, four hunters from the US had a successful hunting expedition (one big moose and I suspect they reached their limit on partriges). I was eating in a restaurant when these four came and sat at the table besides me. When the waitress came and they gave their orders, she had difficulty communicating in english. She was trying her best, she was clearly understanding what they were saying but unable to reply in an understandable english. I was gonna step up and help as a translator but one of them shouted to her something that ressembled this: "You're useless! Is there anyone in this shitty town who speaks a real language?". Both him and his buddies laughed. I looked at them and said: "I speak two real languages but I don't speak to assholes. They're ugly, hairy and their breath smells like shit!" (adding to the fact that they had been in the woods for nearly two weeks, I thought it was clever)". Everyone laughed at they were pretty pissed. Their order came and they ate as fast as they could. When came time to pay, they only had American dollars and were upset that the restaurant had a "Canadian currency only" policy. She told them (well I translated) to use a credit card or to go to the ATM at the entrance.
I got many more stories of American tourists who thinks the US owns the world and should be treated as royalty, but I chose not to let that influence my judgement. People are people no matter the differences. After all, I went four times in the US (and liked most of my experiences) and my ex-girlfriend was an American from NYC.