Sure, but so there is in FB. On Reddit you can have multiple accounts (all pseudonymous) and you can participate on whichever subreddits you like. If there's some sub that isn't too welcoming of your views, chances are there is another that is -- an echo chamber if you want it thus, sure, but no worse than FB.
There's nothing wrong with stating an opinion that is unpopular and being downvoted. It usually still contributes to the discussion.
But I agree that aggregate comment vote is not an indicator of correctness - more of whatever way the wind is blowing at a particular time in a particular community.
You will get rate limited more severely the more downvotes you get.
I've also run into subreddits run by very biased moderators who will mark any stories as spam they disagree or competes with their friends. And due to the shadowban system, many people never realize it.
That's why I stopped submitting comments and stories on reddit. I only browse it now.
shadow-banning is handy for spammers and bad-posters because, to them, it looks like their posts are public. Its not hard to find out if you're shadowbanned (use incognito mode), but it often does the trick.
In the subs I mod I have a long list of awful contributors on an auto-remove list executed by automoderator. I've got people who have been saying awful thing to people for years, but those posts are never seen. Banning them will only lead them to create a new account.