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
Aside from the fact that you’re peeing, you should be washing your hands throughout the day anyway and this is a perfect time to do it. So even if you just peed with no hands, this attitude means ya nasty.