“Relevant factors are ‘the frequency of the discriminatory conduct; its severity; whether it is physically threatening or humiliating, or a mere offensive utterance; and whether it unreasonably interferes with an employee’s work performance.”
Royal v. CCC & R Tres Arboles, 736 F.3d 396, 402 (5th Cir. November 21, 2013) (Jolly, J.).