Poorly behaved preschool-aged children and parents who just let them run amuck. Babies I can excuse, they don't have control over their actions.
In the express lanes at the supermarket, DON'T TRY TO ENTER IF YOUR CART ITEMS ARE OVER THE DESIGNATED NUMBER. And believe me, I've done some of this when it's happened :
Difficulty in finding fashionable gear above a size 14. As I've said before, I dress in a basic/classic/country-club style. I don't want country cute or polyester sleaze clothes.