Dionysus was still being a boastful and dramatic child over the fact that his wife was hanging around her ex. Olympians did not do well with jealousy or sharing when it didn't serve them. Dionysus may have been a demi-god until stepping up to the god plate, but he had gradually lost some of what made him human after Hera destroyed that side of him.
He sat with that drink feeling the same frenzy as his new guest. "Do I know you, doll?"