There's always someone arguing about the purity of art. Art doesn't have a strict set of rules. Anything can be art. Saying otherwise limits it's ability.
Saying anything is art doesn't make it art. If I throw a couple beer cans on the ground, that's not art just because I say it is, it's trash. In this particular case the artist hand painted the labels, which I wasn't aware of when I commented. So, this is art, despite the quirky presentation.
The labels on the cans were hand painted with acrylic, so there was more effort put in to this installation than if they just grabbed some beers at the local convenience store and dumped them out.