I don't think the GP meant a one-sided generalization at all, and your comment reads as a needless partisan dig. The charitable way to read the comment is that

I don't think the GP meant a one-sided generalization at all, and your comment reads as a needless partisan dig. The charitable way to read the comment is that a particular person he talked to was unconcerned by facts, and that this is a common problem with heated/divisive discussions. (This jives with my experience that most people don't care what's true, they just want to make socially approved noises.)