I bet you can comfortably call him a nazi. And I'm almost inclined to agree after reading the post you talk abput.
But that's part of the problem: it's rewarding to target someone that way. It's the easy way out of expressing anger about someone with a lot of reach expressing reactionary, rude, bigotted ideas.
It's easy, because it's powerful and becaus it's simple. Write or wrong. Nazi or not. Here is some food for thought.
https://forward.com/opinion/376984/when-is-it-okay-to-call-someone-a-nazi/