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The way he treated Pam in the last few seasons. When Andy went to rehab for his anger, when he came back he said he wanted then to call him Drew because he being called Andy reminded him of how he was and wanted to be a better person. Jim got all smug, smirked and said "not gonna do that, [i]ANDY[/i]" If he had said 'call me Thor' or something I'd understand but asking to be called another nickname to Andrew isn't asking too much, especially given the reason he gave them.