He's not saying that people with different opinions are nazis, but that actual nazis are hiding behind the shield of "equally valid opinions" when their "opinion" is an absolute obliterator of different opinions, namely "people unlike me should not exist".
This doesn't mean all people saying such things are nazis, but that actual nazis hide among the people who say such things.
Enjoy this lesson on english semantics, brought to you by a blonde-haired, blue-eyed german.
One person there is doing that, while others are actually donating to charity. I can't condemn donating to charity, but the reasoning behind it certainly makes things muddy. I also tried to keep the tone light so it wasn't completely depressing. Cheers for the insult though!