It bugs me because I work hard to make my OCs as unique and different from other people's characters as I can, and then someone comes around and says "She looks like __" or "That personality is like __ from ___"
It depends. There are a lot of nearsighted idiots in this world. Might as well learn to tolerate it lol. I usually don't mind that much at all. BUT when I draw a random generic cat and they say it looks like pikachu, I feel like shoving my pencil in their eye sockets.