have you ever disliked someone for no reason?

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i had this kind of experience lot of times, and i don't know why. he or she dosn't annoy you, did nothing to make you angry or something, i just dislike he or she for no reason.as a result, i don't want to talk to him or her, don't want to get near to this man or woman anyway. i want to know i mentally abnormal or something? has anyone had the same kind of experiecne? i just wantto make sure that i'm normal!