J.G.
Just don't entertain it or make a big deal about it. When he see's that he's not getting the reaction he wants from you he'll stop. I can't stand cleaning up food messes either & never gave my kids the chance to spit or fling food across the room. Sorry, but I work full-time, have a 3 level house, & 2 little ones to keep up wit, so I try to minimize my work load as much as possible.