Kim Kardashian really upset the executor of O.J. Simpson 's estate ... and, now he's throwing low blows at her -- insulting the reality star for failing the bar exam in California!

Here's the deal ... the fourth episode of the new "The Kardashians" season came out Thursday -- and part of it focuses on Kardashian attempting to buy the Bible her dad, Robert Kardashian , wrote an inscription in and gave to O.J. Simpson shortly after Juice's arrest. Malcolm LaVergne

The clip shows Kim talking to Ollie Ayling -- a consultant she works with -- about securing the tome ... diving into the moment we published a story about Kim offering $15K to obtain it.

Kardashian says in the clip that was just an initial offer, and she would've even gone up to $30K because of how much the book wou

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