I'm not the cleanest person in the world, but I'm sure not the most disgusting person either. I piss in urinals, shit in toilets, puke in toilets, and throw garbage away when it piles up enough to be annoying or start smelling.
Sometimes you go to take a shower, but you find a huge puddle of yellow at the entrance, so you go one floor up. That and the showers rust faster than they should. Urine = rusty walls and floor.
I'm sooooooo glad I didn't ever have to experience the dorm life. My daughter did and sharing the bathroom was a nightmare for her and her roommate. Apparently, the suit mates had some bad issues with body odor and other things. They ended up having to clean the bathroom every time they went in there for precautionary sake. You'd think everyone has pretty good hygiene and manners but get them from home and they turn into self absorbed dimwits.
Flip flops or shower shoes is the way to go. Sometimes I'll hit the gym before/between work and school. There's no way in hell I'm touching any part of my body to the floors in any place like that.
Puking...most times, the sink is closer than the toilet, and sometimes, time is of the essence. That's a forgivable offense as long as it's cleaned proper.