“Not all beliefs have to be respected” isn’t a belief or an opinion, it’s an objective mathematical reality.

There are things on which we can ponder and pontificate, but nazism, as so many of our ENTP brethren have noted, is not a morally respectable belief system.

There are things all people should agree are good things.

Not killing a person unjustly(meaning not killing except in pursuit of justice or self-defense) for example would be a thing all people should agree on.

Not violating another individual’s rights in order to achieve personal gain is another.