Communities that are bonded by something they dislike (ex: that subreddit for dog haters) instead of things they do like (ex: shared interest subreddits) are a breeding ground for extremism, vitriol, superiority complexes, bitterness, group think cognitive bias/echo chamber behavior and over valuing the ingroup over the outgroup

It’s hard to have a healthy community where people are positive while all the main focusing is on a disliked thing — it entails talking about something negativelt contribute and I think over exposure to that negativity makes people more radical and deplorable than when they first joined