It is a discriminatory practice for an employer, employment agency, or labor organization, or the employees, agents, or members thereof directly or indirectly to advertise or in any other manner indicate or publicize that individuals of a particular race, color, religion, sex, national origin, age, physical or mental disability, or status with respect to marriage or public assistance, or who participate in lawful activity off the employer’s premises during nonworking hours which activity is not in direct conflict with the essential business-related interests of the employer, are unwelcome, objectionable, not acceptable, or not solicited.