I probably am, but yesterday a BG engineer came out to look at why our heating wasn't coming on. The tank etc is in my bedroom. I heard the light of my ensuite go on while he was up there and assumed he was checking the water or something but went up later to find the toilet lid up so he'd obviously gone in there for a pee.
Now I know I'm a bit anal funny but I don't like people using my toilet. (We have 3 in this house and DH and the kids use the other 2) I have a white carpet in that room, because I don't wear shoes up there, and the room is untidy because no-one else goes in there. It badly needs cleaning too- esp the toilet but as I say, its a private room.
If I'm at someone's house I always ask to use the loo. Had he done so I would have directed him to the main bathroom or the cloakroom, both of which have laminate floor. I just find him very rude to effectively be wandering round someone's house, plus the embarrassment of having someone in an area that is private. (and in outdoor shoes on a white carpet GGRRRRR)
OK I am BU but wouldn't you expect someone not to go into an ensuite without asking? I wouldn't if I was visiting family let alone on a business call.