Is that worse than telling a new mother that she is a horrible person for circumcising her son and that he is doomed to a life of misery and sexual dysfunction because she failed to do the proper research? Because that seems to be a-ok around here.
And really, I've seen maybe 2 or 3 posters ever saying what you are talking about. And those instances I can think of were (with one recent, notable exception) done with respect and not targeted at a specific person by belittling them and insulting them, as I have seen time and time again with regards to circumcision.
I'm certainly not in favor of targeted belittling at anyone. Be it an individual or a group of people. I don't spend any appreciable amount of time on the circ forum but I am not in any way in favor of this behavior you're describing.