Basically sonatine loved to stir the pot, but now he's apparently leaving because the pot got over-stirred, bubbled over, and he doesn't like the resulting mess.
Is that the reason? He said he was embarrassed to be associated with this site. I assumed he was referring to all the mentally ill, racist, illiterate, jingoist, and conspiritard users that have taken over. Are you saying he was scared off by Mumbles' wikipedia links?