How would you feel if I ask a short guy for his leg room?
Why would you ask him for legroom?
I thought maybe he wasn't able to sit properly with it
It's not nice to point out flaws in people's physical appearance. You should be nicer to strangers.
I'm drunk and I'm going to get the legroom from him. He doesn't like me so it will be easy.
Despite what he might think of you, it is still wrong to point out people's physical appearance negatively. You want to give people a good impression about you instead of putting other's down.