Why is it not acceptable to stand on a bus? It increases capacity hugely and if you're only going a few stops it makes perfect sense.
Most buses are rated for "X Standing, Y Seated" passengers.
Most buses are rated for "X Standing, Y Seated" passengers.
You're making a comparison here that's based on having no other choice.
There is obviously a difference between a 5 min journey down the road and a 30+ minute commute.
I think you're overstating the annoyance of standing on a bus.