Where exactly at any point in this post does anyone talk about calling a cis male a woman?
The post is about calling a straight person gay. Equating gayness with not being (real) man is hella homophobic.
Excuse me for making the mistake of pointing out that being slightly crappy towards a straight person isn't the end of the fucking world.
You're so right, straight people already have to deal with so much discrimination and worries regarding their sexuality, it's totally fair to compare it to misgendering a trans person, after all, we all know straight people on average worry just as much about their sexuality, and societal acceptance of their sexuality, than trans people do.
And I would bet fucking money, that if someone was arguing that misgendering a trans person isn't that bad, all of you people down voting me wouldn't have half as much issue with that.
Then you kinda missed the point. The point isn't to call a straight person gay, and laugh at them if they react in any way negatively whatsoever. The point of the post is that despite calling themselves allies, many straight men would react to this as though it were an inherently bad thing if they were gay, rather than just an inaccurate assessment.
If you don't think being a woman is bad, and you present in a way where confusion is reasonably possible, surely you wouldn't get upset at someone (seemingly) accidentally misgendering you. You would simply point out that it's inaccurate. You might feel a bit bummed out that you weren't presenting as masculine as you wanted, but unless you're a major dick, you won't get upset at (at least outwardly) someone with no malicious intent accidentally misgendering you.
If you get immediately upset at someone accidentally, falsely clocking you as gay, that is an enormously strong indicator that you perceive an allegation of gayness as personal insult, rather than merely an inaccuracy.
I still think this it's a dick move, mostly because you never know if someone you think is straight might actually be in the closet, or struggling with their sexuality, but it's nowhere near as bad as you make out, because ultimately someone who is actually steaight, and comfortable with their sexuality, would only get upset at a person for being accidentally called gay if they view gayness as inherently bad.