I Block

A lot! There are 2 basic reason I block: the first is when someone has been ostentatious about his weird lifestyle. The other is when I've been caused great offence or the apprehension of offence. So nastiness, hate, bigotry and demagoguery earns a spot on my block list. But one thing I do *not* do is hit-and-run. No, I take a dim view of those who take a cheap shot at someone then block. When I make a decision to block, I just do it--no parting shots.
But there's a certain side benefit to reducing someone's ability to harass you. There's a certain... class of EPper that is frequently the worst of the bigots. They think they can afford to hate and defame and insult and throughout, carrying the most unbelievable hypocrisy. By blocking such people, I also avoid the temptation to correct them. I think this class of person will be brought down by the weight of their own iniquity. I think it's good that they feel they can afford to behave like mindless animals, and be able to keep their credibility. If I start correcting them, they might come to realize that they can go too far, and will refine their strategy, and thereby become more effective.