I'm not sure I understand your attempt to insult me, but I do understand the point you're making in differentiating between tagging and art. I encounter this issue in my daily work and, as a fan of street art, I've given it much thought. The fact remains: if you are putting art on property without permission, it is vandalism. It is no less a violation of than theft.
Now I'm off to try to make people smile, which apparently is a trait I'm deficient in -- thanks for the heads up.