Here's the most annoying thing about each zodiac sign according to me:

Aries: Short fuse, temper tantrums
Taurus: Imposing beliefs on others, cynicism, overeating
Gemini: My own duality annoys me at times. Sometimes I think it'd be nice to be just one personality.
Cancer: When they're happy, it gets really annoying. They're like children.
Leo: Crying too much, being uncompromising and caring what others think
Virgo: Self righteous, workaholic, shyness
Libra: Laziness, immaturity
Scorpio: Jealousy, possessiveness
Sagittarius: Shallowness and lack of analytical intellect
Capricorn: Stick in the mud
Aquarius: Sarcasm, need for space and "me time" like they're a teenager
Pisces: Everything