1. leave their read receipts on
  2. don't like animals
  3. talk loudly during movies
  4. let their children run around in stores without watching them
  5. don't use their blinker
  6. have openly stalked me on Facebook while I'm next to them
  7. don't tip
  8. clip their nails on public transportation
  9. are loud chewers
  10. Pour the milk before the cereal
    Suggested by @AliciaNF26
  11. Breathe
    Suggested by @margaretyoko
  12. Wear socks to bed.
    Suggested by @bwyatt