That's what happens when you give people the ability to block other people on social media. It can certainly be useful in some cases - no one deserves to be stalked and harassed on social media, and having the ability to block people that are actually harassing you (not just disagreeing with you) can be nice (although honestly if I was being stalked and harassed on social media I would probably just disconnect from the internet for a while since I can still live a full and happy life without Reddit or Twitter, but I get that some people make social media their entire life).

However, having the ability to just "disappear" any dissenting opinions with the click of a button makes these people think that, yes, those people will just stop existing if they go around using their banhammer, and results in shitty echo chambers and purity spirals that make shitty people even shittier. Luckily, there's no "block" button in real life (unless, I suppose, you go around just straight up murdering people that hurt your feelings, but there are real consequences for that kind of thing), so the deeper these people fall into their echo chambers, the less capable they are of being out in the real world, which means that if I go outside I don't actually have to interact with these people.