According to multiple blogs; reports, and sources. The juicy fight started apparently after Kim 's "close friend" told HollywoodLife.com that Zolciak "feels no remorse or sympathy" for the "hypocrite that is Wendy Williams" after it emerged that her husband has been cheating on her for some time.
Pop Glitz further claimed that the feud apparently started over comments previously secretly made by Williams, although, there's no direct confirmation as to what those were.
“Kim thinks she’s a bitter, nasty hypocrite and bully. Wendy kicked Kim when she was at one of the lowest points in her life, accusing her of faking the series of mini-strokes that she suffered, and she will never forgive her for that, or forget about it.”
Via Hollywood Life.