In 1x02 episode, sheriff looks pretty interested in Patrick's appearance, immediately starts asking questions about him- somehow, being suprised. He is like: ''You?! What the hell are you doing here?''. If Tom is really Red John, that's the kind of reaction you would expect from him- he remembers Patrick only as someone who mocked him through public television, false psych from whom he took his family away, as a punishment. And now, suddenly, he is here again, helping CBI! The game of rock-paper-scissors finally triggered rivalry between the two of them.