it's not Gary

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Just as us humans have certain tendencies like collectiing stuff (probably goes back to our evolution from our brothers the squirrels who collect nuts...albeit our collecting is a misguided version of the squirrels colecting nuts for survival....but I digress)...anyway we as humans have an inherent need to judge/compartmentaliz/sort things into a hierarchy...it helps us make sense of our world ...
So one need is to differentiate the mundane and divede. The natural laws of duality, oppossing forces. Artists vs Entertainers fits the bill quite well...so some things that might make one an artist vs an entertainer would be the already mentioned intention of creating a work with no regard for anything other than to get a piece of their soul out into the world and in turn that piece might make others questions things, might make them affirm their own relation the the world around them, etc. Art should be challenging (though provoking) not influenced by commercial interst or money (no sellouts). It should also ideally be idiosyncratic because each individual in their true state is unique.
Entertainment is generally something to pass the time, to amuse oneself or to get lost in briefly. Intent or lack thereof could be applied to Entertainers as well. .
To use authors as example....a Book like Siddhartha by Herman Hesse would be considered art whereas the Book "the Zombie survival guide" by Max Brooks (Mel Brooks' son) would be considered entertainment. I think most people if they were honest with themselves would come to the same conclusion.
Likewise teh Taylor Swift song "shake it off" (minus the twerking of course because that IS art

) is willy nilly entertainment
where as the band "Fugazi" created art..there is a certain je ne sais quoi that "just is"...you feel it
I hope this helps clear things up