Muting or blocking someone online isn’t so much about you just disliking the other person. It’s about protecting your sanity and guarding your mental space from input that you can’t control. You wouldn’t hang around toxic people offline, so why would you do it online?
I personally haven’t blocked anybody in years. I guess I’m not very popular — and I’m fine with that — so this doesn’t affects me.
But I very much agree with this post, it’s all about protecting your sanity in what most people think of Twitter as a toxic environment.