Wow, I thought my boss was not nice. But I don't have to share the toilet with him. Totally gross....should be someone you can complain to...I sure hope so. Sounds like a change in jobs is in order for you!
I'm thinking of an unfunny version of those commercials that show one person working in an office full of monkeys..... They're probably more house broken!
I knew a feral male cat who did that as a territorial thing: would take a dump in the middle of the yard and not even attempt to cover (which is for 'subordinate' felines to do).
Never thought I'd hear of a human with the same instincts.
(Evidently there was no psychological screening for his postion?)