I'm not sure if the designers intentionally made this to appeal to the nerd hipsters (durhurhur, nobody knows what my shirt means!) or if they just noticed a cute bear design that was making waves on the internet and honestly didn't know what it referred to. I've already known old people to pick out beach towels, coffee mugs, etc. with South Park characters on it and go "Oh, how cute!" even though they'd be deeply offended if they ever watched the show.