Employment Law Questions? Ask an Employment Lawyer.
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Hostile work environment has a very specific meaning that is typically different than many employees think. The US Supreme Court has stated that for there to be a legal claim for hostile work environment, the conduct must be based solely on your age/race/sex/disability/national origin and the laws were not intended to create a code of civility in the workplace. See: Oncale v. Sundowner Offshore Services, 523 U.S. 75 (1998).
Unfortunately, if he is doing this for some other reason other than age/race/sex/disability/national origin, you will have to file your complaint through your union by filing a grievance. This is something that has to go through the employer's internal or union process. If you are not comfortable going through your clinic union rep, you need to go through some other union official, but when you are a union member that has to be the first step by the labor laws.