any person because of his race, color, religion, sex, handicap (as such term is defined in
section 3602 of this title), familial status (as such term is defined in
section 3602 of this title), or national origin and because he is or has been selling, purchasing, renting, financing, occupying, or contracting or negotiating for the sale, purchase, rental, financing or occupation of any dwelling, or applying for or participating in any service, organization, or facility relating to the business of selling or renting dwellings; or