ticular decisionmaker. On the other hand, it might not be, as we have discounted "stray or isolated" remarks, even at summary judgment. Brinkley v. Harbour Recreation Club, 180 F.3d 598, 608 (4th Cir. 1999); see also Birkbeck v. Marvel Lighting Corp., 30 F.3d 507, 511-12 (4th Cir. 1994) (finding that decisionmaker's si