It's because their identity is defined by being special. These people have nothing unique about them, so they insist that every little thing they do that isn't exactly what sexists would expect of them proves they're special and unique. This person in the article literally says that being different was what this was all about, which is why having no one to be different from made things difficult. Ironically, the people who claim to be the most independant of societal norms and expectations are the most reliant on it for their identity. A stereotipical man still likes sports and power tools even when he can't see his buds and talk about them while drinking beer, but these snowflakes can't differentiate themselves from that stereotypical man if there are no men nearby to differentiate from.

When your entire personality is "I'm not like other____," then you have no personality