Also, as the standards of "femininity" have become more exaggerated, the category now called "gender non-conforming" is widening to include more and more girls.

Growing up in the 1960s and 70s (and beyond), lots of girls were not into appearing, dressing or behaving "girly," but at the same time they/we weren't especially "boyish" - and they/we weren't called "tomboys" either. Compared to the standards of 2020, I am very "GNC" coz I've never had a manicure, worn nail polish, groomed my eyebrows, had long hair, been into pink, or acted "feminine." But in fact, I'm only "GNC" by the standards of today, where the standards for what real girls & women look and act like are being set by women like the Kardashians, glammed up TIMs like Blaire White and Munroe Bergdorf, and OTT drag queens.

By the standards of the time I grew up, I and millions of others of girls and women just represent one/all the many diverse ways that girls and women appear and behave.