EXCLUSIVE

Jay Z's attack against Kanye West on 4:44 has nothing to do with Kanye bailing from Tidal ... it's all about Kanye's concert rant ... and Jay clearly does not think Kanye's mental condition at the time was an excuse.

Sources connected to the 2 moguls tell us Jay was enraged when Kanye went on stage November 19th in Sacramento and first went after Beyonce with thoughts that were difficult to understand and then calling out Jay for shutting him out of his life.

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As one Kanye source put it, "Kanye was days away from going to a psych ward with some really serious mental issues. We get why he [Jay] was upset, but give Kanye a break."

We're told Kanye had no idea Jay would go after him on 4:44 and when he heard it he was "shocked."