Someone on the earlier thread (apologies, can't find it now to reference) used an explanation that I love as it really struck a chord.
To paraphrase:
Sex is the biological class of being female (egg producing) or male (sperm producing).
Gender is the little boxes that society puts us in based on our sex (though the trappings of the boxes vary by society).
Transgender is "I'm in the wrong box" (which validates the concept of having boxes in the first place).
Nonbinary is "I want a different box" (which validates the concept of having boxes in the first place).
Feminism is "Fuck off with the boxes!" (which denies the whole premise of society associating sex with behaviour).
So anyone coming from the trans or nonbinary perspective is in philosophical opposition to someone coming from the feminist perspective, because one wants to validate gender boxes and the other does not.
Jack you've said a few times that you think gender isn't real and is socially-imposed bullshit. Hell yeah! That's the feminist perspective too. But then you seem to contradict it when you describe yourself as trans and nonbinary, because those perspectives are grounded in the assumption that the gender boxes are real and meaningful (even if individuals want to get out of the box they felt they were in).
I'm not trying to criticise you unfairly and I don't think you're being hypocritical or anything, but you seem to be trying to embrace two conflicting philosophies at the moment. Saying "gender is bullshit but I'm in transition to nonbinary" is mashing together two philosophies that can't work as they are internally inconsistent, which is where some of the irritation on the previous thread came from.
Saying "gender is bullshit and I'll behave however I want (and harm none...)" is internally consistent and feminist in denying the premise of gender boxes.
Saying "gender does not fit me personally and I'm in transition to nonbinary" is internally consistent and trans/nonbinary in validating the existence of gender boxes.
Which of the consistent descriptions do you prefer?