have you ever hated a person for not valuable reasons?

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i'll share you my experienced. when this person starts to live in our place at first its kinda okay for me because there's nothing interesting about her she's plain and simple later on my co-housemates are pissed of to her like they hated her a lot, i dont know when and how this happened but the funny thing is i tried to defend her because on what i've seen she's innocent on all this actions. karma attack!! it happens to me i hated her i want to ignore everything about her. when she talks "gosh i dont like her voice" when she asks "its so irritating me" when she's trying to have a conversation "it's so stupid" her smell "cant take" the worst when she's trying to be close to you "grrr.... i hated it" but she so harmless.. but why i feel this way towards her not only me. maybe im mean? were mean? i really dont know... do you ever encountered this in your life?