As Allure notes, Aries are competitive and willing to do whatever it takes to be on top; the sign takes an "every person for themselves" approach to matters. Our Mindful Life labels this type of behavior as selfish and claims Aries will use you as a tool to get what they want.
The worst trait of this zodiac sign isn't its selfishness, competitiveness, or lack of empathy, though, but rather its impulsiveness. According to YourTango, Aries are impulsive eaters and spenders, which is extremely harmful to any friendship or relationship. Not only will they spend money they don't have, but they'll do something or say something rash, which can create some pretty tough situations, the outlet points out. However, despite their rashness, Aries also can apologize and feel regretful of their actions.
As said, like any zodiac sign, Aries has both its positives and negatives. And, yes, this sign can be rash, hurtful, and mean; they can also be passionate, optimistic, and confident (via Cosmopolitan). The good comes with the bad. Remember that.
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