Ever been insulted by someone? Especially by someone older? Well, it's time to move to Missouri, because there your tormentor is now a criminal! And if the person insulting you is over 21 and you're under 18, your tormentor is a felon! How cool is that! I think every teenage nerd in the country just started trying to convince their parents to move to St. Louis.
All kidding aside, the legislation is the predictably over-the-top and stupid reaction to the Megan Meier tragedy, where the mother of young Ms. Meier's enemy "drove" her to commit suicide. What the mother did was despicable, but illegal? Come on. Suicide may be triggered by emotional distress, but 99.999999999% of the time it's the result of latent mental illness. You want to fix the problem of kids killing themselves and others (see Columbine, etc.) because they've been picked on? Remove our society's stupid-ass stigma against seeking mental health assistance. Criminalizing meanies isn't the answer, and I'm pretty sure it's unconstitutional anyway.
(Also, isn't "emotional distress" already an oft-abused tort?)