There’s no comparison between the levels of profanity and hateful venom you’ll find at left-wing sites such as Huffington Post and the comments posted at Little Green Footballs. I guess I shouldn’t be surprised at Howard Kurtz’s lame attempt at moral equivalence though; it’s what mainstream media does, whether the topic is blogs or “terrorism” or the Arab-Israeli conflict.
Note that he mentions that the Washington Post message boards also have a problem, although he basically brushes it off before attacking LGF. What he doesn’t say about WaPo’s boards is that the venom there is posted almost exclusively by left-wingers—and it’s not a sudden surge. It’s been out of control for quite a while.
See also here.