YANBU, that's vile.
Someone once sat next to me, opened a can of baked beans and started to eat them cold with a spoon.
A couple once had sex in the seat across from me. She had a long skirt on, it was late at night and they were drunk enough to think they were being discreet, they weren't.
Someone was sick on my shoes.
I saw/smelled a mother changing a shitty nappy on a train table.
I watched a group of young men hovering up cocaine off a train table.
I got stuck in the middle of two brawling groups which ended up in one man being hit around the head with a fire extinguisher that another man had pulled off the train wall.
Fifteen years of commuting, mostly at odd hours of the day and night, I don't miss it.