I really dont understand why shias and sunnis hate each other?

i was born into a sunni family. im not perfect but i try my best at practising my religion. But anyway i dont understand why sunnis and shias hate each other. Ive met i couple of shia families. I dont feel the same amount of animosity towards them as they feel for me. i dont hate them at all, but perhaps they havea... show more i was born into a sunni family. im not perfect but i try my best at practising my religion. But anyway i dont understand why sunnis and shias hate each other. Ive met i couple of shia families. I dont feel the same amount of animosity towards them as they feel for me. i dont hate them at all, but perhaps they havea reason to hate me since they are a minority or something i dont know. I never really knew anything about shia or sunni until about a year ago . Even though i was a little suprised it didnt really phase me. But anyway i was just wondering why there is so much animosity between sunnis and shias???
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