When Michael told us that Liz deserved to be teased because she was cuter than he was, it led me to expect that we'd have a whole bunch of strips wherein she supposedly got him into trouble 'on purpose'. That would lead to the alarming prospect of a thirty-one year old man who hadn't changed his thinking in twenty-six years. A grown man who'd think that a toddler was deliberately tormenting him is someone to avoid. However, we find something different. We find him shifting from that to the times Elly swooped down on him and started yelling. Here he was, just trying to be a kid only to have every single thing he did make her holler and scream with her arms failing and her face a mask of rage. He can't fight that enemy and win so he has to find other ways to rebel. That means that he tagets things that she likes to get back at her. Messing up tax forms and walloping people on the head with his bear only go so far, though. To really punish her for yelling at him for no reason, he strikes at the child they only had because they were mad at him: Lizzie. This leads me to believe that after talking out why he picked on Liz, he'd realize a new 'fact': she was just a stand-in for Elly. He might even make a stumbling attempt at an apology based on that 'wisdom'.