The belief of disowning your past interests/friends in fear of scrutiny and the possibility of humiliation.
The followers are called, "Deserters", "Hypocrites" or in some cases "Desertocrites"
Regular Guy: "American Pie, the original, was a great film. It was hilarious!"
Deserterism Believer: "American Pie is NOT a film! It's a piece shit movie."
Regular Guy: "But didn't you own it on VHS and DVD, and have a poster of it on your wall back in the day?"
Deserterism Believer: "Well yeah, but that was, like, 10 years ago. So, yeah."
Regular Guy: "Oh, okay... I guess."