It isn't going to win anyone to bad-mouth someone behind their back to someone that knows otherwise from actual experience. Someone knows you are not the vile scumbag they make you to be, from direct experience. Yet, the witless (knowing that) insists on making you out to be a scumbag anyways--which is a blatant lie.
Since it is supposed to be "the truth", what room is there for such blatant lying?