Kim Kardashian Blasts Critics of North's 'Bob Ross' Painting

Kim Kardashian is FUMING at folks questioning the authenticity of a painting she says her daughter made herself ... insisting it's the real deal, and people doubting it have way too much time on their hands.

KK is blasting critics of North's oil painting -- depicting a mountain, a river and a surrounding valley ... which drew comparisons of Bob Ross' artwork (and lots of jokes). But, there were also those who straight-up said North couldn't have done it on her own.

You can tell Kim's pissed from the get-go ... "DON’T PLAY WITH ME WHEN IT COMES TO MY CHILDREN!!!" Kim goes on to say North and her BFF have been taking high-skill oil painting classes lately, and just wrapped their art projects after weeks of hard work.

North's pal is Ryan Romulus, the daughter of Kim's good friend, Tracy Romulus. Tracy posted a photo of Ryan with her own oil painting of a wolf. Fans had zeroed in on Ryan's painting as well ... she also completed a nature landscape in the same class.

Anyway, Kim goes on to say this about "grown adults" who are taking shots at her daughter's ability ... "How dare you see children doing awesome things and then try to accuse them of NOT being awesome!?!?! Please stop embarrassing yourselves with the negativity and allow every child to be GREAT!!!"