This isn’t your college or work place break room. If people are saying something you disagree with you can just say it and you won’t be fired or ostracized for it. Yeah, people will probably get angry and say mean things to you but those are just words which can be ignored. Offence is taken, not given.
This is mostly for the lurkers who upvote unpopular opinions but don’t comment. You can speak up - you’re not alone.
Absolutely. In-fact I’d say most people aren’t blocking enough. If someone thinks of free speech as freedom to be an asshole then they should be blocked by everyone and left to shout into the void. However, I don’t think the unpopularity follows you outside the thread you were saying unpopular things at. The vast majority of people wont remember you.