First off, nobody said anything about calling people you disagree with Nazis besides you. Source: the meme OP posted. You can even read it yourself.

Secondly, if someone disagrees with saying Nazis are bad, then they are in agreement with Nazi ideals which is the only real requirement to be a modern Nazi, therefore, disagreeing with that specific statement literally means you are a Nazi

Thirdly, fuck Nazis

And yet multiple people in this very thread are doing exactly that at the thought of someone saying fuck nazis

Except for the last 10 years of nazis using it to hide behind the guise of SiMpLy DiSaGrEeInG, of course.