I think the subtext is that flights aren't supposed to cost what cheap economy flights cost; they should be substantially more expensive. So you can "unaccept" the discomfort by paying for them what they should cost.
I can get a seat on a flight that will take me to the opposite side of the world in less than a day for ~$600. That’s not unacceptable, that’s amazing. Cheap and fast international travel has to be somewhere on the list of most revolutionary post-industrialisation innovations.
There are plenty of carriers (some might even say all of them) today without standing places where you don’t have to pay for using the toilets and many of them are profitable. You don’t need to accept ridiculous things for that. It’s just that every time, one of them will try to squeeze just a few more cents out of you and if the public allows them to do that, all the others will jump at the opportunity.