This must be the raccoon version of nails on a chalkboard.
"Rocksy," the very literally named raccoon, has a trick. When the cat food bowl is empty outside, she'll go scratching at the sliding glass door. But she doesn't just use her claws: she picks up a rock and repeatedly rolls it over the glass, making a sound that's about as annoying as dudes claim vocal fry is.
The video's poster isn't angry at Rocksy, at least, despite the fact that the raccoon has scratched up the windows. Rather, she points out that Rocksy is a mama with babies to feed. And sometimes, to feed your babies, you just gotta roll a rock against a window repeatedly until you get more cat food.