> I imagine it could even work like Sponsorblock does, and we could crowdsource people who's comments are inflammatory

Let's discuss how to make this reality.

Do you want a ranking system where more the people downvote some person, the better? if so how do you prevent spam in that, do you take metrics like karma or what exactly?

I don't think that captcha is a solution either but also that I don't know how to feel about removing entire swaths of people, I can think someone writing something bad once and probably get into this "black-list"

Another aspect is once again the black list, I don't know but do we really need a system of essentially a communal ban?

The only thing I can see it reasonable is if there is a slop bot comment poster but I rarely face this issue but if you do, you can probably create a tampermonkey script and tampermonkey scripts work on chrome,firefox and "Userscripts" which should work on safari as well and that script is most likely gonna be compatible on both tampermonkey and userscripts.