IF it really happened, here's my take on the whole thing:
Randy was super pissed on RAW about what seemed to be a botch by Kofi in the triple threat match. Forum members have speculated in numerous threads as to what Orton was actually upset about, but it was obvious he was angry as fuck because he took a fit on live television. That anger stayed with him backstage after the match, and overnight as well, and the next day he's at some restaurant and a random kid takes his photograph, then asks for another one and he blows up at him. Makes sense to me.