There are a few insecure men on here who for some reason feel threatened by PUAHate and decide to hate them back, but I think most of us are reasonable enough to simply ignore them and legitimately not be bothered by them at all. I really don't see what the big deal is. Insecure people hate on each other all the time, and that's what makes the internet go 'round.
I do realize that much of the content posted on PUAHate is not worth paying attention to, to say the least, but they do express some sobering concerns of how some of the marketing within the PUA industry has gotten out of hand. They have their place, I suppose.
For example, I remember reading a thread on there about how the marketing on many PUA's sales pages appeals far too much to patients of Asperger's Syndrome; pickup is not a suitable alternative to professional SPAM since a lot of pickup material involves theoretically analyzing many social/sexual concepts. Mystery Method, for example, will exacerbate AS symptoms instead of actually helping the dude get laid.
All in all, though, that site is mostly just a troll trap. And, as anyone familiar with the internet can tell you, "don't feed the trolls." As soon as you give them your attention, they win.
