Maybe people think that the question "what is art" is so downtrodden that it becomes somewhat meaningless to discuss.
Not meaningless per se, but more that if you've had this discussion before, you know where it can go:
1. Arrive at a defensible definition of Art. It will be vague and unsatisfying for many (see my previous post, #41). I find it a beautiful definition, and it has affected the way I live my life. But many folks do not pursue a true definition of Art, they pursue a definition that allows them to declare $ThingTheyDoNotLike as Not Art. A defensible definition of Art never lets them do that.
This discussion involves many tangents, as a person proposes a specific qualifier ("Art communicates", "Craft has a purpose, Art doesn't", whatever, there are tons of them), and then someone else shoots it down with a great example of something that fails the qualifier, but everyone agrees is Art. You arrive at at something similar to the definition I proposed in #41, and some people are unhappy.
2. You fail to get beyond the subjective, "I know it when I see it", "How can this $Crap be Art?" level of discussion, and everyone is unhappy.
In my view, the OP is so laden with baggage that only through heroic effort can it be dragged it into a dispassionate realm of debate, where folks can be civil and constructive posts made.