Agreed, people in the chat are unnecessarily harsh at times. I think that just follows from the tenor of the show. I've even found myself making comments like, "I checked out xyz. I'm inclined to think it sucks. Didn't love it, but maybe should give it a chance. Or not. What do others think?" I think that's a pretty common mind-set among FOT. There are plenty of decent comedians, movies, TV shows, etc. that get panned by FOT, but don't really deserve to.
Also, I understand Tom keeping the callers on a leash, and the negativity to a minimum, considering there's already so much of it flowing around. No doubt, that means he's GOMPed a number of people that he might have later regretted hanging up on. But Tom's gotta guide the show, and he does it ably. If it were my show, I'm sure I'd make the mistake of letting callers say pretty much anything, and that wouldn't be good.