North West is all about keeping things real ... she even once called her mom, Kim Kardashian , out for crying over her tricky co-parenting relationship with Ye .

Kim revealed the jaw-dropping anecdote during her bombshell appearance on Wednesday's "Call Her Daddy" episode while discussing the hardest part about seeing her ex-husband's frequent rants about her and her family on social media.

The Skims founder says she chooses to keep silent about various allegations ... such as his claim she keeps their four children -- North, Saint , Chicago , and Psalm -- from him ... and she only says positive things about him in front of their kiddos. Gallery Launch Gallery Backgrid

However, 12-year-old North is apparently quite observant ... and told Kim she kn

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