I think you missed her point. I don't think Dahlia is talking about Clinton's supporters in general, I think she's pointing out that this relatively small but vocal group of protesters are undermining their own stated goals. Their stated aim and their actions are in conflict.

I would argue that PUMA et al are the ones turning this serious political issue into a junior high hairpulling match. They claim to be championing women's rights, yet they're doing their best to ensure that a misogynist like McCain gets elected?

I think, in fact, that Dahlia would agree with you. Let's dispense with these absurd, indeed even anachronistic, histrionics and have an adult conversation about sexism in America.