I fully disagree and say you didn't over-react at all. The guy is a cunt. But you didn't use their own words against them. They weren't asserting their personality. They were asserting their preference for a character personality type. I personally often find myself enjoying reading through a story with a character type who is very different from who I am. I play games/ read stories to escape my shitty reality
I guess my point is - they deserve to be treated like shit, but it just frustrates me to see faulty logic used as a basis to attack someone even if they deserve it. I would fucking defend hitler if someone was using an illogical argument to attack him lol