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
What a banger. Also just shows how long this shit has been brewing and everyone just kinda overlooked it until now it's too late.