A licensee, his/her agent(s) and/or employee(s) m not directly or indirectly refuse, withdraw from, or deny to any person the services, accommodations, advantages, facilities and privileges offered on said licensee's premises on the grounds of race, creed, religion, physical or mental handicap, color, sex, national origin, age, occupation, marital status, political opinion, sexual orientation, or personal appearance, except that dress codes may be utilized where posted notice is given.