I think it has a lot to do with the immaturity in the lyrics, or maybe he just really doesn't like the song at all. He also probably got sick of playing it, maybe that's why they stopped. If you notice, they only really play the singles from Hybrid Theory nowadays, they don't play stuff like With You, Forgotten, Cure For The Itch, Pushing Me Away, High Voltage, My December, APFMH or Points anymore, etc. Runaway actually stayed in the sets longer than songs like With You, High Voltage, Forgotten, Figure.09, Easier To Run, Hit The Floor, Nobody's Listening and more did! The last time it was played was at Bamboozle in 2007, it was my first LP show. Songs like Figure haven't been played since 2004, and Forgotten since like 2002, etc.