This is elder abuse.

There are already comments claiming this, thanks.

Except when it was on 4chan and it was actual Nazis just being Nazis. So no, not blatantly sarcasm.

I only know it as “I approve of this”, not “lol, I don’t approve of this, but I say I am to be hilarious”. This is the danger of adopting this Nazi Internetspeak to be funny.

There’s no reason to be rude. See Rule 1.

“Based”?

Admirable; praiseworthy, especially if the thing that is considered “praiseworthy” is unpopular or controversial.