I do not think this statement is true. Cubism is well known, but so are other movements. I believe more people know about (and like) Impressionism. Probably also Italian Renaissance.
If you mean is doodling at the back of class art, then yes, it probably is. Depending on what you are doodling, I reckon your "art" would be abstract art. By the way, if you are doodling in class,...