If you witness any improper conduct in the workplace, it is important to express that type of behavior is inappropriate. Failure to do so can lead to creating a hostile work environment.
If you see any offensive pictures, videos or cartoons in the workplace, remove them and state that these will not be tolerated.
If you overhear offensive or discriminatory language, communicate disapproval.
Incidents and your actions should be documented for future reference, and the offender should be monitored for any future occurrences.