You're right, but I'd not make that argument here. I made a similar argument when this recalcitrant doctor was pulled of a United plane a few years back, justified in my view, and in line with the conditions of carriage. But, yeah, HN crowd wasn't pleased.

(Many said they'd never fly United again, and most people wouldn't... United share price dropped a bit, then went straight back up to where it was and beyond. Well, until COVID-19.)

Edit to add: BTW, the point is not that you should always read the TOS. The point is that you should read the TOS before complaining if something unexpected happens.