I think the big difference is on Mastodon, you have way finer-grained control over what content you are exposed to. Twitter is more like one giant global state,

I think the big difference is on Mastodon, you have way finer-grained control over what content you are exposed to. Twitter is more like one giant global state, so if there is toxic content, it can leak to way more eyeballs that don't want to see it.