Hatred is the most powerful negative emotion. It is destructive and sickening. Whatever you're going to do to satisfy this feeling will even create more hate. In the end it will eat you up, it destroys you from the inside-out. I know many people really hate graffiti, either way I'm looking forward to reading your comments. (:
The person that is responsible for this graffito named himself "El Odio" (lit. The Hatred). Dunno, who he is and why he chose this name. My guess is it is a reference to graffiti's bad reputation.