I went to the toilet on a busy commuter train. Came back and the person I was sat next to has his feet on the seat I had vacated. I said excuse me please to him and he begrudgingly moved his feet and sat down. Hes way over my seat with his body anyway with the way he's sat but when I sat down he said 'for fucks sake'. When I asked if there was an issue and not to say for fucks sake to my simple request, he said I was sitting on his knee. I am absolutely not touching him. I told him so and that the way he is sitting means he is taking up some of my seat and that hes very rude, including putting his skanky feet on the seat. He shut up then, but its time after time of men (and a few women, but mostly men) who have their bags on the seats or are just shit fellow commuters with their incessant sniffing and just being unpleasant when asked to move their belongings to free up a seat. AIBU?