For renaming things, could make positive comparisons to Europe or French Canadians having different names for things.

"Yeah, that makes sense, just like the French. Now Lake Ontario will also be known as Lac Amerique. Multiculturalism!"

Though using the french spelling/pronounciation might make it more obvious they are being made fun of. Hard to say which would be more frustrating, comparisons to cultures they hate or support for having multiple names (along with the assumption that it's just adding a name rather than changing the name) rather than taking the obvious bait.

Though in all seriousness, he can call it whatever the fuck he wants. It doesn't really affect me one way or another.