Do you use the block feature?

I've got three people on my block list.

One spun a convincing tale in an exchange of lengthy PMs over a period of several days, but turned out to be either a particularly perverse form of troll, or someone with serious problems separating reality and fantasy.

I think the others constantly made snarky and ignorant comments in response to mine, so I decided to stop annoying them.

I don't understand why some people think blocking is unfair. When you block you're not limiting anyone's freedom of speech, but simply exercising your freedom to limit the crap you encounter.