> accusing people of being "far right" or "Nazi", and to call them ignorant or stupid because they want other policies does not work and only increases polarisation.

This is true but this is not what's happened here. The discussion is about whether Musk's gesture is a Nazi salute. OP called ignorant people who do not see it as such. They said nothing about those people's opinions and did not accuse them of being far right or Nazis themselves. In fact OP didn't even call Musk a nazi in their post. To conclude that it was their hidden intention to do so is a leap in logic that is not obvious.