Cool, so going forward, I'm going to call your mother Ms. Whorebitch, and anytime anyone asks me what your mother's name is, I'm going to tell them her name is Ms. Whorebitch, and that if you want to have anything to do with me or anything I can provide you, you have to call her Ms. Whorebitch, and I'm going to do this while I am one of the most powerful people in the world.
Sound good to you? I'd have the authority over that interaction, so it must be perfectly fine with you.
Your argument is fallacious. It's based on a fallacious appeal to authority.
Based on your argument, Canada should rename Washington DC to "Fuckface Central". They're allowed to.
The fact of the matter is, we live in a society, and for a society to function, we need to have agreed upon norms.
This breaks those norms, and is causing issues in society. It's antisocial behavior, and it's not even in an effort to change things for the better, which could be excusable.
As far as countries having different names in different languages, of course they fucking do! Everything has a different word for it in a different language! Nippon is not a word in English, Japan is. Deutschland is not a word in English, Germany is.
There are no instances that I know of where a country that speaks a language, has an endonym and an exonyms in its own language, shy of transliterations when referring to the name that other people use in other languages, in their own. So that's like if your name was Jim, but I just always called you Bob.
And, for the record, Füçk Yú. I speak three languages, one of which doesn't even use the Latin character set. I'm quite cognizant of the different diacritics that different letters have.
Also, Canada owns a greater majority of Lake Ontario than the US does. It's not 50/50. ...and, again, Lake Ontario has been named that longer than either the US or Canada has been around!