The problem with changing words is that women, females, who are more at risk of attack than males, lose their ability to have their own spaces and identities and to organize for their own safety. As we see they actually face attack for continuing to fight for their sex-based rights. That's identity appropriation.
> I don't think changing the language is bullying, shaming, or pushing an agenda
It doesn't have to be but it is. Look at the three-year long hate mob attacking Maya Forstater and JK Rowling because they objected to losing sex-based language. They both receive many credible death threats. That's bullying to push an agenda.
Even when this is sugar coated it's a poison pill. Accepting that males could be "trans women" immediately requires you to accept that they should use the women's washroom despite being the wrong sex and that sex being the large dangerous one. (Females in male spaces isn't a safety issue so I'm ignoring it for now.)
> people making changes that are logically consistent with how they experience the world. Again: if trans men exist, then pregnancy must occur in men and women.
Occam's razor would suggest that if a person is pregnant they probably aren't a man. Being that man basically means "the people who don't get pregnant". That is the difference between sexes.
> The reason you hear people react strongly is because they believe they have a simple logic, and people come in and say, "I deny that trans men exist, or I deny trans men are men." That's a pretty strong thing to say and a pretty strong thing to hear.
You say that as if your trans man friend will vanish in a puff of logic. Nobody is denying that they exist or threatening to make it happen and it's emotional blackmail to exaggerate like that.
There's a middle ground we could shoot for. These people would probably agree your TM friend was Masc (/Femme), because as a newly created word it doesn't have an existing meaning and isn't used to gate access to single-sex spaces like prisons.
You use words like "comfort", "support", "included" and say that you feel uncomfortable entering "gendered" spaces.
I submit that women are not supported, not included, are uncomfortable, and actually are unsafe when men enter women's spaces.