You're right, Peter Gabriel is insufferably pretentions and self-righteous.
Pretentious, affected, narcissistic and contrived are the salient, operative words of our times as far as I'm concerned. Oh, and phony!
I agree with the Buggles that "Video killed the radio stars". It's become a medium of posing, dancing and outfits and haircuts.
From '80 to '86, he was a quirky, edgy new wave act. But starting with the 90s, he discovered therapy and World Music (don't get me started on that concept...) and just became another shrill shill for the 'progressive' global cause. I saw him on some late night comedy show a few months or years back--he'd become this weird, pasty fat guy in a Ming collared jacket singing sensitive-sounding crap. Sad.
His stuff with Genesis was painful, especially with the flower pot masks and the costumes.