That's muting, not blocking.
Blocking prevents them from seeing or interacting with your content So, yeah, you're censoring in a way. Not knowing this is a red flag.
More importantly, If you don't constantly challenge your views with actual interaction (not just reading), you will become trapped in a bubble.
I certainly don't need to explain why I block anyone, but when I'm the one with a ridiculous point of view, blocking out dissent won't change that.