unlikeable characters.

what exactly makes a character unlikeable?

emotions (or lack thereof), handling of social situations, mannerisms, quirks, interpersonal skills, extreme extroversion/introversion, the list goes on and on. but then what makes an unlikeable character likeable? there's some redeeming factor, i think... maybe Showing the Sweet Side, Honor of Discipline, something that just endears the character to us. just how to weave two of those factors together is the problem.