Unfortunately, in a lot of cases these days, common courtesy isn't so common anymore.
It ran off to elope with personal responsibility

.
The only thing that an attempt to "stare me down" will achieve is for me to decide NOT to get up for you/your kids, no matter what. As soon as I notice someone struggling I will offer my seat (if I can - I have a connective tissue disorder, which means that sometimes I really do want/need) the seat, but, if I feel that someone is "staring me down", but butt stays firmly planted in that seat.
Yep, as I've said a few times, I'll gladly get up for
anyone 9 times out of 10, without being asked. However, the moment someone "demands" (and that includes giving the glare after a polite "No, sorry, I can't do it this evening"), then I'm sitting all day just to spite you. Yup, I'm that petty.
In my initial post, I did not mention that the 'stare you down' comes after asking you for some help and/or seat. I totally agree that staring someone down without opening your mouth first is rude. You'll get no disagreement from me there.
But, if I ask and you either ignore me or say no - then yes, I am going to stare you down. That's where I draw my line in the sand.
The proper response when met with a "no" or even an ignore (how do you know they heard you or were even paying attention, I know I've been off in my own little world more than once) is a simple polite "ok then". Not a staring match. That's just answering perceived rudeness with rudeness and likely to get you nowhere.

wow you sound like you are either the perfect parent or have zero kids. I'm guessing zero kids with that response. Clearly no one with kids should go to Disney World at all lest they get tired and need to go back to the resort for bedtime/snacktime, etc......
Could I have worded my reply better - yep. But you are arguing for the losing team. It's as simple as that. No matter how poorly I word my argument, it is a terrible thing to just sit there and do nothing. Shame on you.
So, us with zero kids should be forced to stand all the time? Heck, we shouldn't even be let into Disney without kids since it's all about them. (See, I can make hyperbolic responses too!)
The answer, as always, lies in the middle. If you don't get on demanding someone else get up, and graciously accept it when no one does, then everything's fine. If you get on a bus not expecting to sit, and you're thankful when someone does offer up their seat, again, everything's fine.
The issue comes in when you get on the bus, demand a seat, and then glare at those who don't follow your orders. You are now into the realm of expecting total strangers to take the responsibility that you should have taken yourself.
Now, suffice to say, I've never seen this at Disney (well, once, a poor
ECV lady starting complaining when the bus that was packed to the gills (I was standing ON the white line) couldn't fit her on after the monorails went down, but that's different). During my trips (late Sept at CSR), everyone has been friendly, graciously offering their seat or accepting the necessity to stand. (And I ride buses the entire trip too, early morning, midday, and late at night). When I've remained seated (due to last year's misjudgement on footwear), I never once got the evil glare, and when I've seen others sitting, I've never seen them get it either. So, for the most part, it's purely theoretical, but my pettiness stands

.