I thought it was a nice parallel there - childish and infantile ^^
To be honest I should have clarified that it was my opinion, but it looked to me like a case of "you're a idiot... because you are!" Hence, infantile unless the poster gives some kind of justification, which I didn't see in IANAT's post. (That wasn't directed entirely at you by the way.)
I felt it was better to encourage civil and mature behaviour before the thread started going downhill.