The ones I unfollow are generally shills, people who make absolute statements, demagogues that heavily depend on rhetoric instead of substance. Unfortunately, Twitter's format pushes people into this behavior too. In that case, I block, in order not to become a conduit for these people's toxic messages. I block out of responsibility for my own and my followers' sanity.
> I feel like many, many problems could be solved if more people remembered that. If nothing else, it could reduce polarization.
IMO the platform design and parameters cause this polarization. It's not enough to educate people outside the platform, when the platform is a hotbed of viral messages, and the dominant strategy is to be an "asshole", according to the etiquette of the outside world. On the platform, however, it is what makes your account successful.
One idea is to define strict rules of digital etiquette. Kids could be taught these starting at a young age. You could also enforce them algorithmically on the platform.