There are other places to draw parallels from. Runway fashion shows nearly always show bizarre items no sane person would wear to the local grocery store. But they each, individually, make a new statement that draws some sort of reaction from the observers. It's the very essence of art.
Off the catwalk, scenes like Lady Gaga wearing a meat dress to an award program might offend some people, but you can't deny the originality and subsequent reaction. There were certainly people claiming it wasn't fashion or art.
Yet if someone aped it, it would be suddenly boring and passe, and people would totally recognize it as being derivative. And that sure sounds like art.
There is simply too much art being produced in the contemporary art world for your argument to make any sense at all.