Because they’re the same thing. One group gets special treatment and the other doesn’t and somehow that’s fair.
Edit: Nazis don’t exist anymore, guys. That’s a 40s German political group. You can’t be a Nazi anymore than you can be a Whig. You could be someone who agrees with 40s-era Nazi ideology but, again, you would still lack membership in the now-defunct party. I realize name-calling is central to attacking Parler sympathizers but at least be accurate.