And he'd never say that in front of Dinah. About Dinah's friends.
The writing on that page makes me feel he's being written as particularly smarmy and hypocritical. (No idea if that's supposed to say something about social liberals in general or just Ollie:) or if it's just maybe a byproduct of the desire to include the nudge nudge wink wink of a threesome.
Ollie's not even picking up on his BFF's cues. He's oblivious to Hal's behavior here: wanting to tell him something important and not really wanting to talk about the incident.