Such gender price discrimination has been outlawed in several US states, with California, Maryland, Pennsylvania and Wisconsin banning discounts such as ladies' nights that favour one particular sex. However, no such legislation exists in Nevada, which is where the concert in question will take place.

A picture showing a screengrab of the online ticketing page has since been shared around Twitter, prompting reactions that range from the confused to the outraged.

New York-based journalist Jessica Roy tweeted "this is definitely either sexist or feminist, but I can't tell which," while another user shared a link to the nightclub's site with the caption "Good job Taylor" – a reference to the feminist campaigning of Harris' girlfriend, Taylor Swift.