Even without the algorithm, though, I also believe that humans just aren't evolved to have some kinds of discussions asynchronously, remotely behind a screen. I've found myself needing to disconnect from social media because it leads me to having negative feelings about people that I know I like. E.g. after the overturning of Roe v. Wade there were some posts by family members who I know and love, even though I know we don't share the same politics. After seeing their posts the first thought that went through my mind was "WTF is wrong with these people??" But if we had been discussing it face-to-face, I'm sure we would both have been more respectful of the other person's viewpoint, or at least would have agreed to disagree and move on.
Everyone has seen it (and probably done it) - said something extremely hostile in an online forum that we would never say face-to-face.