I've never blocked anyone from anywhere on any site like this.
That being said I did "Unfriend" one person on Facebook. His beliefs were different from mine and I didn't have a problem with that but, he was mean about it, giving bad advice, and just being a jerk. It was upsetting me so I unfriended him for my sake.
Over time it seems some people ( a lot of people) are getting so they will say anything that comes into their head. A lot of people seem to have no restraint these days. They never know when to bite their tongue. I spend less time with those people then what I used too. Actually, I spend less time with all people in general then what I used too. I miss having conversations with people but, now every conversation turns into a argument. I gave up on people.