"it's correct because I say so and everyone who disagrees is wrong, once again, because I say so."

This is pure gold.
Glad to see we agree.

You're basically saying anyone with a different opinion from yours is ignorant, among other things. That pretty much seems like a "change or else you'll stay ignorant"
The sex/gender thing isn't an opinion.

Mostly because a certain person seems to think that language is made by scholars in ivory towers, and not through natural evolution by the speaking masses. If you're saying that about a language, you're saying that about the language speakers, because they're the ones who make it.
No, most people do not "make" their language; they just imitate the work that others before them already did. (Some more poorly than others.)

Only a select few of them are influential enough (usually by pure chance) to effect change.

It doesn't matter what you think. Until the majority accepts it, it's not correct. Not because a minority wants it to be.
Sorry, that isn't how correct/incorrect works. Majority of the class getting the wrong answer doesn't suddenly make them right. Nice try though.