Md. Code, State Government § 20–401

This subtitle does not prohibit any person that is licensed or regulated by the Maryland Department of Labor from refusing, withholding from, or denying accommodations, advantages, facilities, privileges, sales, or services to any person for failure to conform to the usual and regular requirements, standards, and regulations of the licensed or regulated person, provided that the denial is not based on discrimination on the grounds of race, sex, color, creed, national origin, marital status, sexual orientation, age, gender identity, or disability.