I've seen many people flee social media, especially Facebook and X, taking refuge in other platforms.
The most common places are Telegram and Discord, since technically there aren't feeds that expose you to so much bad and unpleasant content.
But here a big problem and dilemma arises: if you already have established friendships on those sites, you end up isolated, especially because too many people prefer to be contacted first rather than initiate contact.
And besides, these social networks aren't for everyone; cowards aren't welcome there. If you're going to be on them and can't handle pressure, then you're going to be screwed.
It's fine to take a break, say for a week or two; I do it sometimes, and it's really effective.
But pretending to disappear completely, first of all, besides being cowardly, shows that you don't matter much to your friends with whom you already have strong bonds.
And if your reasons for leaving are due to a particular group of people, you've already proven that you agreed with that group, it's that simple.
Moral of the story: Never, ever do anything that makes you agree with someone (specially vicious people)
There are always ways and tools to avoid seeing certain content from undesirable people; it's simply a matter of knowing how to use them.