Agreed. I'm progressive and try to engage in good faith, but have been banned from a number of subs such as whitepeopletwitter (racist name), politics, latestagecapitalism, and several others because they are safe spaces. They are agitation echo chambers. I get that sometimes, skilled trolls play devil's advocate to take conversations off the rails, but the banhammer falls far too quickly on the large subs. It really is propaganda trash.
Reddit is alright for municipal subs, hobbies, and technical stuff. As well as mindless entertainment, my favorite is idiotsincars and catastrophicfailure. Anything where inside jokes are rampant or memes are allowed is trash (political compass memes, programmer humor). Political subs are good sometimes, only if you find a good highly up oted comment with good sourcing of data. But the bulk is just as simple minded as a fox news comments section.