Joel is simply misinformed about Canadians and their practices while visiting Florida.
Quebecers, especially Francophones, love Florida. They head there in droves during the Winter. It appears Florida residents dread this yearly onslaught for two reasons. Overweight men (from Quebec) love to wear speedos while in Florida. Not a pretty sight, regardless of the language you speak. Second, Francophones have a reputation for being poor tippers. Needless to say, there's a big service industry in Florida.
I haven't a clue as to how factual these two transgressions are. All generalizations, including stereotypes, are usually based on at least a little bit of reality. Therein lies the problem. Fat men in speedos who speak French will likely "stand out" more that a fat dude from New York or Toronto. Francophones would likely get "labelled" quicker because they have a characteristic that stands out.
Now that doesn't totally explain Joel's comment given how great he looks in a speedo. He was just looking for a smartass comeback line for Trevor.
On the prejudice or bias scale, I would have to rate Joel's remark as being pretty low. Definitely forgiveable.
As to the political actions proposed by Steve (Wildone), it's not likely we Canadians will ever get around to it. There's a minority government right now and sweet little seems to get done. Besides, we'd have to have all those committee meetings and public hearings first.
Maybe later in the story Joel will say something "nice" about Canadians and all will be forgiven. In the meantime, he should definitely continue to wear the speedos.