I'll chime in, but don't be too offended cuz we're only naming bad traits. And actually I'm basing my opinion off of people I love, otherwise I wouldn't know their bday.
Aries- competitive, pushy
Taurus- stubborn, self-centered
Gemini-?
Cancer-emotional, jealous
Leo-?
Virgo-critical, self deprecating
Libra-vain, quick tempered
Scorpio-?
Sagittarius-restless, moody, impulsive
Capricorn-selfish, aloof
Aquarius-stubborn, "never-wrong", controlling
Pisces-emotional, needy, intense, unrealistic