Every time I've ever been to a museum that didn't have hands on displays or wasn't of planes or cars, I usually just look at the stuff and think to myself "Yep, that's some paint on a canvas."
Someone appreciating art could say the same about planes and cars and go "Yup, that's some formed metal."
Art is in the eye of the beholder. Some people see a lot in the classical stuffs which is why it is still around. Some turn to more modern things. Some lulz at paintings altogether and pursue creativity in other things be it sculpture, writing, engineering, programming, etc. The world is full of art, you just gotta look with an appreciative eye :p
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There is no shame in not knowing; the shame lies in not finding out