In Whose Name Documentary

Kanye West's "In Whose Name?" third-person documentary is in theaters today, and it's giving viewers a glimpse into how volcanic his last few years have been ... including how things got bad between him and his ex-mother-in-law, Kris Jenner!!!

In one clip, obtained by TMZ, Ye is filmed crashing out on Kris in an explosive shouting match over the megastar rapper's public perception when he was hospitalized back in 2016.

Kris told Ye it didn't matter what the internet peanut gallery thought ... prompting a temper tantrum from him on the spot, repeatedly screaming, "It does matter!" in her face.