Reddit is a big site with a diverse age distribution and an Eternal September cycle of user churn.
I have no interest in YouTuber drama, or discussing the finer points of communism v fascism because I've already gone through that phase of my life (freshman year). Maybe that's why I don't see all the [removed] comments; I'm just not on those boards.
To the point of bickering - that's human nature. I expect humans to argue over the shade of blue, sneakers of the month, or whatever. What I don't expect humans to do is regress mentally to some child-like viewpoint of erasing and censoring any opposing viewpoints.
Reddit is radically different than it was 10 years, and not in a healthy, engaging way. Browse some non-technology subreddits and you will quickly spot the echo-chamber effect and group think in action.