My roommate only washes up if he poops, never after peeing. Now every time I’m in any of the common areas I have to wash my hands after touching anything I haven’t wiped down. Thus, I wash my hands twice every time I use the bathroom; once as normal and again in the kitchen because I touched the taps, light switch and door handle in the bathroom which likely have groin sweat on them… /rant
I used to tell patients who I took to the bathroom and then I managed their peri hygiene (with gloves!) that we would still wash their hands even though they didn’t touch anything because it was just a good habit to have.