It absolutely is not. Maybe on a thread about The Little Mermaid and whatever other culture war nonsense topic grown adults bicker about, but I don't see anything like that on r/webdev, r/android, r/buttcoin or other popular subs.
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.