I don’t even know what Mastodon looks like and I don’t know who the guy is, but I’m just assuming he’s lying because it sounds like the usual “crazy pronoun libs” dog whistle.

Yes.

Dedicated key on an azerty keyboard on tablet/laptop, or switching back to French setting on the phone. If weren’t French I woudn’t bother searching for it every time.

I can’t remember if fiance or fiancee is correct

Fiancé is male, fiancée is female.