I don't think it's unreasonable for someone not super experienced in truck driving to assume the vehicle will be able to drive on most roads. I feel like there's a lot of "Person blindsided by uncommon hazard gets laughed at" around.
I think it is resonable to expect someone to inform themselves about the hight of the vehicle, especially if they are not experienced in truck driving.
If you are not experienced and do not inform yourself that's just careless.
I am not super experienced in truck driving, but I think the reasonable (and rational) thing if I am driving a big truck, is to not take a chance and go under that if I don't know how tall the truck is.
Most of these places have numerous warnings to trucks to turn back. Anyone looking at several warnings and continuing on, or worse too distracted to notice, sorta deserves the chiding.
That bridge 11' 8" that always gets posted, has an over height sensor that stops the light to red, a sign warning you that you are over height, hazard lights, and the height bar is in bright yellow. People still hit it regularly.
This is a defense that nobody needs or asked for. If you don't understand the very, very simple concept of clearance you shouldn't be driving a vehicle and especially not a truck.