The MBTA shall not display or maintain any advertisement that falls within one or more of the following categories:Demeaning or disparaging. The advertisement contains material that demeans or disparages an individual or group of individuals. For purposes of determining whether an advertisement contains such material, the MBTA will determine whether a reasonably prudent person, knowledgeable of the MBTA’s ridership and using prevailing community standards, would believe that the advertisement contains material that ridicules or mocks, is abusive or hostile to, or debases the dignity or stature of, an individual or group of individuals.