Think you’ve had a bad day? Wish you were more successful, more affluent – because maybe that would protect you from slights by the hyper-critical, the unfriendly, or just the plain mean people in your life? Nope. But take heart from watching these celebrities react to truly vitriolic slams with grace (or at least with superior spelling skills). Anyone can hurl an insult via Twitter, but you don’t have to let it stick.