A couple years ago I remember reading an article that bullying in school has strong epigenetic effects in the children given birth to by bullied people. That realization, that by bullying people you don't just break them, but even hurt their unborn children ...
Could you link to article? I would be really surprised if they had some evidence for causation. I would think that theoretically something like bullying might have large confounders. Basically the likable quarterback doesn't get picked on, but the kid that doesn't fit quite fit in does. And at least some of this is probably genetic.