It is pervasive, including from the medical professionals who are supposed to help.
TODO: figure out if gender policing is distinct from transphobia, or if it's all part of the same spectrum. Gender policing is something that all adolescents face, while transphobia is something that people who blatantly cross gender boundaries face. But it's all part of the same effort by others to try to maintain the ostensibly "rigid" boundaries.
It is absolutely the case that there is a huge difference.
You can also compare masculine females (tomboys) to feminine females (girly girls) — it's more fashionable to be a tomboy.
Although gender identity and sexual orientation are distinct, many people read male femininity (and female masculinity) as only gay.
It seems like Western culture is more homophobic of men. This suggests that the above rule (the difference of the two is misogyny) isn't correct.
TODO: explore this more