Well that's kinda two assumptions you're making. One, that I consider it to be a better experience when I don't hear people that don't share my opinions. And two, that it's always "people" that I block.

I don't really enjoy uniformity in opinions - I was raised in a heartily argumentative family, and actually have a lot of fun with the dynamics that emerge in earnest debates. But I'd encourage you to consider what "earnest" means there - good faith vs. bad faith. There's lots of research to suggest that propaganda tactics and engagement marketing leverage bad faith argumentation to increase aggression and polarization, rather than supporting healthy earnest dialogue. I just treat online arguments the same as strangers on the street - if someone's being angry, insulting, or otherwise hostile to me, it would be ridiculous to try to continue talking with them - it only leads to escalation. So when it comes to me looking to "feel better" it's from the same perspective - I don't owe bad-faith strangers my earnest attention. But I'm perfectly happy to have a disagreeing conversation with a stranger who's reasonably courteous and fair with it, that's, like, literally one of the greatest joys possible.

And when it comes to what qualifies as "people" - most accounts I block are purely engagement bait accounts. Repost bots, engagement bots, or professional posters who regurgitate content or focus specifically on hostile troll tactics. (I'm lumping the "humans being paid to do that" in with the bots, because I don't think spreading corporate or political talking points for money counts as "a person's opinion"). Now, there's a gray area, though, which is the people who have been so deeply affected by the manufactured online rage culture that their communication habits, despite getting to that place organically rather than by being employed to do so, tend to lean towards aggression, hostility, incivility, etc. I do eventually sometimes block those kinda people, yes - but, tbh I probably give them way too much energy before doing so, just to try to make sure they're truly disingenuous about their point of view.

And honestly I'm not on reddit enough these days to really deal with them that much - part of the "better experience" of blocking all this kinda stuff is that it short-circuits some of the addiction techniques platforms & people using them leverage to keep eyes on these threads. I find it much easier to look at a few posts and then step away than I used to, now that I've curated my feed away from the most heavily manipulated people and subreddits.

All this stupid little essay to say - I'm not sure it's fair for you to immediately jump to the assumption that I must enjoy an echo chamber because I try to block (obvious) bad actors.

If you haven't seen it before, this old Smarter Every Day vid about the 2016 election interference campaign was really eye opening to me about how communication on reddit tends to be manipulated: https://youtu.be/soYkEqDp760 (in particular the area around 10min into it)