"There is just a square here, so what?"

It seems that the experience of art can be underwhelming rather than overwhelming, and this seems to make many deeply uncomfortable.

"What is this?"

Its as if the only emotion that one takes in their wallet to an art exhibit is awe. If you can't spend awe then the trip is a failure. But what about the rest of your emotions, your boredom, confusion, your evolution, your contempt, your disgust? Those are all valid, and being exercised.
In classical Indian Dance there are 9 emotions or the nava rasas. Possibly translated as 9 flavors. The main job of a drama-dancer is to envoke them: Anger, disgust, jealousy, fear, awe, strength, heroism, love, equanimity.

"I don't get it.."

Maybe you are trying too hard to get it. Just react and pay attention. Not to the art as much as to yourself.

"I can do this, ergo not art."

Bizarre distinction.