Nazi salutes are protected speech and not "beyond politics". Yes it's disgraceful, and it's reasonable to leave his platform. But it qualifies as "dumb shit".

I think the point is to distinguish ‘political opinions that I am comfortable disagreeing with people about, and can still be friendly with people who strongly disagree with me’ and ‘morally unacceptable opinions that I will neither listen to nor associate with anyone who hold them’.

There are many political opinions that I strongly believe in that I am comfortable disagreeing with people on. I believe everyone has a right to health care, and that society should guarantee basic necessities for everyone. I even feel that belief is a morality based belief. However, I can accept people disagreeing with me, and can accept that there are some strong arguments against my belief, and that good people can disagree with my position.

On the other hand, if someone believes that certain races should not have the same rights, or that women should be given less agency than men, I will not entertain that argument or accept that it is just a political dispute. That is a fundamental moral issue, and is beyond JUST politics.

Protected speech can be beyond politics. Politics doesn't subsume all protected speech.