Is it just me, or are lots of mods just banning anyone with a dissenting opinion?

I like to be a bit contrarian, play devil's advocate, stuff like that, so sometimes I know what I post isn't going to jive with the community I'm posting in, but I think there's value in that. It starts a discussion and it offers a different pov.

Maybe I'm wrong and stupid, and someone can reply and explain why. I think that would be a net benefit. But what happens instead is my post gets deleted and I get banned. :/

I genuinely think this is a real issue and it leads to echo chambers, but am curious to see what other ppl think? Am I just salty? :)