Like, the most recent example - Gina Carano. Do I disagree with what she was saying? Absolutely. Do I think that she deserved the amount of abuse she was getting on Twitter and elsewhere, and her eventual firing from Disney? Absolutely not.
Like, how is that different than Boston banning certain artists because they didn't like what they were saying? Because we(as in, more "liberal" leaning people) disagree with them? It's stupid and I don't agree with the practice.
Edit: and of course this effect exists here as well. If you disagree with something it gets downvoted until it's pushed to the bottom of the site, made nearly invisible, and eventually once enough people complain it disappears entirely behind a flagged tag. Most people don't actually engage in an exchange of ideas, they just make sure to penalize someone for saying something they don't like(downvote) and move on.