a family member went through a traumatic substance abuse incident a few years back and went to rehab. when he came back, what you're describing here was his new, apparently instilled mindset toward life. ignore unhappy things, enjoy happy things, begin to exhibit increasingly, worryingly, alienatingly bizarre/erratic behavior, arguably worse than the initial (legal) substance abuse. this mindset seems to be the new generalized prescription these days and I hate it.
