Personally, I'm not so sure how I'd feel about this one, were I put in our fresh-roasted birthday dude of the hour's shoes: on the one hand, the card isn't exactly sweet talk material, but on the other, grandma could be kind of a comedic badass. Perhaps with age and wrinkles comes a greater appetite for insult-worthy humor.
Untethered by the chains of shame, kids say some extremely brutal stuff to the people around them. It can be insulting, straight up psychopathic, and at worst, hauntingly accurate. Kids are mostly weird and dumb, and they often have stupid beliefs, but damn if they aren't sometimes savagely on the money.