Welcome! I also came over recently from Reddit as well after 12 years. The smaller niche subs were always friendly, but the bigger subs... well, I felt the same as you, with all of the negativity, drama and trolling. More often than not I simply remained a lurker. I gotta deal with enough stress in real life, don't need to invite it into my leisure time.
The early days, during The Great Digg Migration, weren't bad at all, but it all slid downhill in later years, until it was more about doomscrolling for me and less about actual interaction. Coming here, I feel like everything is new and fresh again, and that everyone is welcoming and friendly. It's been quite refreshing!