People not moving on the seat next to them in a public transportation:/

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There is enough place for everyone but in a bus which i regularly take or any bus, everyone (even some foreigners are mirroring that) are sitting near the aisle while seat next to them is empty. All i know is they paid for a bus ticket but not for the seat so, i usually sit where is not a situation like that; next to a person who sat next to the window, leaving a seat next to them empty or somewhere entirely empty. But, if i want to sit and there are free seats but people are hiding them sitting on aisle side, i ask is the seat empty and kind of expect of them to move. I mean, i don't know why they are doing that, sitting next to an aisle but i hate it when old or older people do that and then they move only their legs in opposite direction and expect me to hop and sit next to them, while they are not moving at all. I've experienced that and i'm getting too old for that stuff. And yes, the space to come through another seat is so tiny. This Thursday, this same thing happened with a young girl, she moved only her legs on opposite side so i can come through and to whom i'm maybe looked younger but all i could say in irritated tone was i am too weak to move and could she please move to a seat next to her (i even said it in a formal way, without realising it). She moved but i didn't like being exhausted additionally after 1hour sitting in a dentist chair and this girl messing with me. Also, 2-3 days before, a girl put her bag on a seat next to an aisle and when i asked if i can sit, she moved the bag but sighed. I chuckled inside me but that's also rude. Back to this girl after my dentist appointment. I don't entirely blame her but all people who get seated, i think they are all capable to move to a seat next to them but why they like sitting next to the aisle, i really can't tell but that's increasing and irritating to ask them all the time to move. Sometimes people stand up and let you to sit next to them, on a window side, which is not right too but they do some action at least. Was I insensitive? What do you think? After one seat got empty, i sat there so i wasn't sitting next to her the whole trip and, yes, it happened that we both exited at the last stop. If the situation was the opposite, i believe the young girl would flip out.