However, if you consider artistic expression as a basic human quality, that we can find back in every individual person, than you can state that ‘everyone is an artist’. The German artist Joseph Beuys also held this view and admitted everyone to his art academy.
The title ‘artist’ is not protected, anyone can use it. The art in-crowd however disposes of all kind of mechanisms and instruments to keep those ‘amateurs’ or ‘Sunday painters’ or ‘hobby artists’ at bay. Unfortunately, as a consequence, well performing ‘amateurs’ seldom gain public recognition, and Art Academy educated ‘real artists’ can sell their products even when they are lousy.