I like having a large group of online friends and the variety of viewpoints that I am exposed to as a result. I am also very sensitive to the risk of avoiding criticism or dissent, only hearing views that I agree with, and ending up in an echo chamber.
A couple of times recently people from my past have asked to be friends on Facebook and without so much as a "Hello, how are you?" have waded in with critical, snide, smart arse comments.
I have no problem unfriending them and avoiding their company in just the same way as I would in real life. Life is too short.