1. Misgendering. GC probably see this as no big deal, but transmen do.

It's the other way around. GC sees it as big deal when people who want to be free from gender are misgendered with genders anyway. We want gender to be abolished, therefor we don't refer to people as genders to begin with (and can't misgender). Female trans people on the other hand generally don't see misgendering as a big deal long as it's not trans-identifying people getting misgendered. Trans people usually support redefining words to refer to gender instead of sex which with normal usage of language inevitably leads to a lot misgendering. Thereby trans people are among the ones who tend to engage in misgendering the most.

Another one is insisting trans men are lesbians in denial.

I agree we shouldn't insist male-attracted females are "lesbians". Male-attracted females can't be lesbians as lesbians are homosexual, male-attracted females are bisexual or straight. But if the female trans person is exclusively attracted to other females then referring to the person as a lesbian is just stating a fact.

However, trans men are better able to pass than trans women, and many trans men say once they pass, they are seen as men.

People often say female trans people tend to pass, but as many of them also insist female trans people who look like regular women "actually" look like men I remain doubtful of that.

One moment GC says trans men are traumatized women escaping misogyny or lesbians in denial, many also say trans men are fetishizing gay men and fujoshis/YAOI and call them creepy. Which one is it?

Both types exists. No size fits all so we don't believe trans people are all the same. There are probably many other things that can lead to dysphoria too.