[Serious] Please convince me gender is binary

[tackattack]

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No I'm not trans, I've worn dresses and had bows in my hair at times in my life though.

So straight, sometimes cross-dresser?  Your profile pic looks pretty butch.  You aren't talking about a Halloween costume, I take it?

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No, for about 3 months straight (no pun intended) I pretty much only wore hammer pants or a tiered patchwork skirt and sandals with socks. I also had long hair and painted my fingernails when I wasn't biting them off.

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I'm not pulling punches.  I think that gender dysphoria is related to anxiety, rage, depression, and a general psychological ill-being.  When you see a man in a dress, he may not be experiencing gender dysphoria, but you know that he's outside the normal psychological range in at least one area.  You could say the same thing with ANY display of atypical behaviors-- clenched fists, talking to oneself, or so on.  Maybe someone clenches his fists all the time and is a lovely human being in all other regards.

There are two reasons why people get that "creepy" feeling about people who behave outside the ordinary:
(1)  It's just superstitious nonsense, and they have to get over it.
(2)  The sense of creepiness is sometimes an indicator of danger, and the cost of ignoring it is potentially very high, evolutionarily speaking.

I'd say, on the whole, that the transition from first realization of dysphoria to its resolution by self-assignment of a new identity (with or without physical modifications) must be a very traumatic, and any expression of that trauma in facial expression is likely to make people uneasy.

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I think this is where I'm seeing a problem with your reasoning. I didn't wear a dress, or stop wearing a dress, based on my gender identity at all. I simply thought it would be utilitarian and a fun experiment and socially express my individualism and attention seeking aims. I stopped because of Bermuda shorts and then cargo pants/shorts became more utilitarian. I didn't see myself identified by what clothes I wore or even hold any importance on clothes outside of their weather value. I knew what a man was to me and I had a peepee, and I conformed to both of those.

You have gender expression, gender identity, and gonadal gender. Clothing only plays a part possibly in expression. You can't tell by what someone is wearing whether their gonadaly or internally gendered as; you can only make suppositions based on your definitions of "what is a man/woman" what they're expressing to you. You observe, voice, behavior, mannerisms, body structure, peer interactions, attire, etc. and form a supposition on what the object you're observing is presenting as their gender. The problem is that you're still making automatic instinctual observations of what someone's gender "is" to you, and ignoring that the name tag attached to the person says steve. I believe the counterargument surfacing is that you should see that person as an individual and as steve, and not give 2 shits about their expression, identity or gonads.