1) its a projection of selfhate.
you think about your self what has been said about you (eventually on a verry low level that can be ignored)
or you don't think you are what you have been accused of, but you strongly think that you should not to be, what you have been accused of, but you don't consciously admit that you think so, or that a part of you may like to be just like what you have been accused of.
in order to defend yourself you must state again, that you are not as accused, and go on to agree that you should not be like that, or else the other person would be right in hating you.
this removes you further from your shadow, which thinks thinks you are a little as accused or that you want to be like that.
this weakens you. you may disappear and only the shadow will be left. the accusation will seem true. more than that your self-hate which forbids you to be like that is reinforced.
2) you want to kill the person that has accused you. but don't admit it to yourself. you tell yourself, that you ought to be mad at the person, because the person is wrong after all. so you enforce your hate, while at the same time lying about how severe your hate motive is. like oh yeah you are just the victim, not the aggressor, and you do not realy want to kill anyone.
3) the circle closes, as you look at where the secret killing hate comes from. its probably identical to the side in you, which believes that the accusation is true. it generally believes that one must not listen to a conflicting party ... well i m not sure what it is, but somehow it turns against you.
thats confused and incomplete, but the best thing i can channel this early at the morning (GMT)
i think i see how the hate toward the one who accuses you might weaken you:
lets say you are weak
and someone called you "weak ass"
and a voice of you, lets call it bambi, says about itself "i am weak",
while another voice in says: "i am not weak, and must not be weak"
and you say loud to the accusant "you shit, i am not weak"
this is like saying to your own bambi: "you weak shit, you are not a part of me"
cuts you right in half