Anyone who explodes here in rage probably never worked in support. You get your share of assholes. Actually, you get more than your share of assholes. Because you are in the mind of some people the source and reason of everything that ever befouled them. If you treat the customer support badly, don't expect good service. Your 5 bucks a month are not paying his paycheck, your call is not his reason to exist and you are essentially of no particular interest to said customer service rep. He's there to HELP you. With a problem that may or may not be caused by you, but one that absolutely certainly was not caused by him or her.
I can only guess what happened here. My guess is that Comcast suits forced support to be nice to even the most obnoxious waste of oxygen calling, and this is their only outlet. If you ask me, a very, very tame reaction. I've seen people actually resort to physical violence.