People confusing masculinity/femininity with "feeling like a guy/girl"
I'm not sure if my take on this is correct, but it's something I noticed with many people that say they're "under the non-binary umbrella". These people genuinely confuse feeling masculine with "feeling like a guy" and vice versa. There are cis guys that feel feminine and don't act nor "feel" like the typical cis man. Instead of thinking that this is okay and you can be/feel feminine as a guy, they come to the conclusion that "they're not 100% cis" and that they must be a demiguy/non-binary/genderfluid or whatever bullshit gender that was made up. The same thing for cis girls that are tomboys, that fall down the wrong internet rabbit hole and suddenly identify as a "genderqueer masc enby", without understanding that it's actually completely fine if you're a girl/woman who's masculine.
And I'm actually someone who likes the societal idea of men being masculine and women being feminine, as it makes it easier to pass and I just like that societal norm and I will conform, because I like being seen as just a normal guy. But I don't have a problem with people being masculine/feminine, no matter their sex. But it's important for me that these people don't get confused by some trans activist and gender fanatics and end up going down the medical transition route and regretting it, becoming detrans and start hating on all transsexuals. Or they never transition medically because of a lack of dysphoria, but start preaching gender identity and that you can identify as everything, which also hurts actual trans people and cis people as well, because even more of them then get confused. The mistake in thinking that the title implies harms both cis people and trans people and we should stop it.