I tend to avoid blocking communities and people on social media as I don't want to create myself an echo chamber. On other social media, such as x/twitter, I only block folk who are directly abusive to myself.
There is nothing wrong with protecting your sanity. Why would you want to be exposed to vile nonsense, you're not going to read breitbart forums in your spare time are you? Like... You're the only one looking out for you online. The platforms are just trying to turn your participation into profit.
While I generally STRONGLY agree with this sentiment there are some things that I either find too repulsive or offensive to want to see on my feed. People calling for the death of politicians, or insisting that everyone other than them is intellectually inferior, or just the general usage of derogatory terms... yeah I don't need to be angry :D
ETA: it also felt like there was way too much Russian and Chinese propaganda on a lot of those. As an American that gave me the ick