Lesbian Letdown

The action in which a man realizes, or is told, a women he is attracted to is a lesbian.
(I'm a lesbian don't attack me)

Guy 1: "She's so hot"
Guy 2: "You mean Lillian? You know she's a lesbian, right?"
Guy 1: "huh? No I didn't."
Guy 3: "Man talk about Lesbian Letdown amiright?"