I'm a bit skeptical myself, but that's all you can be without any other information. To say that she definitely did something more worthy of being kicked off the plane, is just pissing in the wind. You don't know. It's really not out of this world that the airline could consider "misgendering" someone a grave offense to their staff. Hell, you can get fired for that shit. Don't act like this shit isn't being taken seriously.
Remember that old MS volunteer that got let go for not understanding the pronoun game? Yeah, you had people doing the same shit and immediately dismissing the report and alleging that she must've been racist or just too old to work there anymore, and it turned out the initial report was 100% accurate, and she was indeed let go over the ridiculous reasons stated.
Just saying, you don't know, and is it really that unbelievable in this day and age? I know it sounds a bit ridiculous, but there's lots of ridiculous unbelievable shit going on with this movement.