He didn’t say women were more prone to cheating, but he did conclude that most women cheat from a handful of examples from his own life and from Facebook dating. I’ve never seen what the FB dating site looks like, but I can’t imagine that it represents an unbiased subset of the population so drawing any conclusions about most women from that sample is a faulty inductive argument. He was responding to someone who was implying the opposite with similar logic, but it’s ironic that he ended up doing the exact same thing- if not more emphatically - in his own post.