I only read the site 2-3 times, so I may have forgotten every single thing posted there. But IIRC, it was reasonable in tone that merely pointed out GR's failings and demanded that he be held responsible for them. I don't think that's classless.
And I've seen very few people kicking GR when he's "down." In fact, I've seen quite the opposite -- most folks thanking him and saying what a classy guy he was. Indeed, even
www.firegregrobinson.com has changed its front page to thank GR for doing the right thing.