Can you all stop downvoting the OP? Please?
OP, you probably already the stuff that I'm going to say; I'll share for the sake of others.
Here's what I believe to be the first part of the comic from the OOP (it seems to have been deleted):
TL;DR of the "Egg Prime Directive": "the fact that trans people have an unspoken agreement not to tell people who are questioning their gender whether or not they are trans."
Now here's my take: YDI.
We humans do the same things for different reasons. And we should not be assuming why someone else does it.
That's one of the aspects of the egg prime directive, and the mod is simply acknowledging it - that the only person who perhaps knows why that AMAB kid is playing as a girl character is the kid themself. (Or why the AFAB kid is playing as a boy character.)
The other aspect is that, even if the person happens to be trans, you don't break an egg open from the outside; instead you keep the egg warm and the nest comfy. You don't deny it, but you don't confirm it, you make sure that the person feels loved regardless of their identity.
So no, the egg prime directive is not some "vague ass ideology", as you called it. It has good reasons to exist. Not following it does more harm than good.
Beyond that: yes, you were enforcing gender stereotypes. And yes, you were rude and hostile.
I also think that the 2d "chill your head!" ban was appropriate.