Student Annabelle Sacher was shopping at English supermarket chain Sainsbury's when she decided to give her girlfriend a spontaneous peck on the cheek.
Sadly one fellow customer didn't see the "light kiss" as a romantic gesture - and reported the couple to a security guard who allegedly then told them to leave.
The female guard explained that the shopper had complained that the lesbian clinch was "disgusting", and that she was "worried for her child".
Infuriated, the 22-year-old reported the incident to fellow gay rights activists online, declaring that Sainsbury's was guilty of perpetuating a hate crime and that she had a "human right" to kiss in the supermarket.
The row began on Saturday - which was National Coming Out Day - in the Sainsbury's on London Road in Brighton, a town known for its vibrant gay scene.