Olicity was a surefire sign common sense was going out the window in an episode. Felicity regaining the use of her legs and then immediately walking out the room because Oliver hadn't told her about his son was bad enough. The fact he acted that way because he was given the ultimatum of keeping the secret or never being a part of his son's life by the mother just made it worse because it wasn't ever something Felicity had a say in to begin with.