Is it really anti feminist to criticise other women?

Again and again on feministing, members leaving comments that are critical of an individual woman (usually someone in the public sphere) are critised for being anti feminist. Does being a feminist really mean that we should never criticise another woman for the way she lives her life or the choices she makes?
Of course many criticisms of woman in the public sphere are anti feminist. But I don’t believe that this means that all criticisms of individual woman are anti feminist.