Here's why Phil is getting so much hate, he brought it on himself.
When Brock, who from all accounts HATED Pro wrestling when he joined the UFC, couldn't give a shit about it. He joins the UFC, and he said "I had to get out of there, I needed some real competition, and you can't get that in WWE, and when you're eating a fistful of painkillers and drinking a bottle of vodka to numb the pain, and you're travelling every day, I just couldn't take it anymore". and that was it.
Phil on the other hand not only talked shit about wrestling itself, he also talked shit about his colleagues saying "They don't have the balls that I do to do this", he talked shit about the fans of pro wrestling, and just generally acted like the litle prick that he is. Had he just shut his damned mouth and gotten on with it, it wouldn't be anywhere near as bad as it is now.