What a moron. If the guys are paying for anything, they're paying for the girls to show up in greater numbers than at regular prices.
The lower prices attract more women. More women attract more men, who want to be there because there are more women than usual, etc., etc.
Has it not been the history of humanity for men to ply women with alcohol?
This nitwit is bitching because he can't get laid....even on a 1/2 price ladies' night, even at 2AM. Pathetic.
Most ladies' nights at bars are like shooting fish in a barrel. Simply find a solid icebreaker like "will those red shoes take us all the way to Kansas?" Delivery has to be funny but not mocking, or overtly sexual. Works every time.