Ollie was too irritated with the vampire who was clearly getting way too big for his britches to really appreciate Dinah's flirtatiousness. Especially when he knew that it probably had something to do with the fact that said vampire force-fed her his blood. Wasn't that tantamount to rape?
No advances she made in her present state of mind could be taken at face value. He knew how awkward she really felt about him.
"Isn't there some rule about what happens to vampires who attack people?" he said, "Can't we get a warrant for his execution, or something? It sounds like this is becoming a pattern with him, that should have been checked a long time ago."