I really believe that most parents are sane. At the least, no mom wakes up and says to herself, "Today I'm going to be a crazy, enabling parent who is going to respond to my child's problem as if I'm also 13." But too often a parent decides she should be the one to put the mean kid in his place, sometimes even by impersonating her child online. It's also very common for angry parents to fire off an e-mail to everyone they know with pages and pages—all in caps, single-spaced—saying how horrible this other kid is, by way of "warning" others. Another dirty trick is the petition—imploring others to avoid the alleged bad influence. Resist! Instead, guide your child to develop an appropriate strategy.