This. Also: Unless his friendship is so amazing that you can find a way to overlook this, it's not meant to be your band. Speaking for me, this would drive me crazy unless I knew going in that it was a legitimate compositional goal of the band to write music this way. And from your posts, I glean that it is not that.If he wants to progress as a musician he should listen to you.
If he's a great friend then he would listen to you.
I think you can be this guy's friend, but probably not his bandmate. I understand that's a hard sell, but it's possible to be friends without being in a band together, and it's also possible to be in a band (and actually work well together) without being friends.