"`resolve[s] all ambiguities, and =digs] all factual inferences that could rationally be drawn, in favor of the party opposing summary judgment."' Spinelli v. City of New York, 579 F.3d 160, 166 (2d Cir. 2009) (quoting Brown v. Henderson, 257 F.3d 246, 251 (2d Cir. 2001) (internal quotation marks and ci