Let me be practical. If you take a shower in the dormitory bathroom of your tutor's workplace, then there is no relationship between you and your tutor. If you don't want this relationship to be exposed, then it is best to swallow your anger or find some dark way to retaliate.
If what I guessed above is not correct at all, then there are many legal ways. You can go to the workplace to solve the problem. Check whether the employee belongs to the workplace. If so, go through the workplace. If not, you can report the case