24 C.F.R. § 100.600
(a) General. Quid pro quo and hostile environment harassment because of race, color, religion, sex, familial status, national origin or handicap may violate sections 804, 805, 806 or 818 of the Act, depending on the conduct. The same conduct may violate one or more of these provisions.
(2) Hostile environment harassment. Hostile environment harassment refers to unwelcome conduct that is sufficiently severe or pervasive as to interfere with: The availability, sale, rental, or use or enjoyment of a dwelling; the terms, conditions, or privileges of the sale or rental, or the provision or enjoyment of services or facilities in connection therewith; or the availability, terms, or conditions of a residential real estate-related transaction. Hostile environment harassment does not require a change in the economic benefits, terms, or conditions of the dwelling or housing-related services or facilities, or of the residential real-estate transaction.
(i) Totality of the circumstances. Whether hostile environment harassment exists depends upon the totality of the circumstances.