Are you the same person as this guy? You seem to keep making new accounts and posts to hide your post history and complain about redditors.
I certainly can't know whether what you've experienced is actually toxicity or just criticism, as I can't see your post history. But any site with sufficient mass will be flooded with people like this. All the way back to 1993.
Part of being online anywhere with open signups and free discussion is just dealing with that sort of thing. The only way to prevent it is to spin up your own defederate instance and only allow people to join who you deem worthy of conversation with.