I'd love for you to explain to me where that follows from the standards I've laid out.

I explicitly said that a straight person who is secure and comfortable in their sexuality will not mind. Being secure and comfortable in your gender identity ain't exactly something trans people are known for, so only someone who knows fuck all about trans people could possibly think this is remotely comparable.

Straight people, with very few, if any, exceptions, didn't grow up being told they're gay. Being forced by society to express themselves as gay, even though it made them feel awful. They didn't spend potentially decades feeling unwelcome in their own skin. They don't spend hours upon hours worrying that society won't accept than as "a real straight". They don't spend days worrying about the hate crime, discrimination and legal persecution they are susceptible to if they don't look straight enough. Triggering that level of trauma isn't the same as making someone slightly uncomfortable because they found out they unknowingly didn't express their outward sexuality as strongly as they felt. It isn't remotely, on any level, comparable, and that is an objective truth.

I am also notably not defending calling straight people gay. I'm just pointing out that deliberately misgendering a trans person is on a completely different plane of shitty behaviours. Not every shitty behaviour is automatically equally shitty.