I agree about the deeply ingrained hatred of single mothers. I’ve always found that kinda ironic considering that at some point most of us ARE single mothers; even if we don’t stay that way. So, to hate single mothers is to hate mothers.
As to the rest, in retrospect you’re completely right of course. I was a young adult in the 90s, not a teen and I always thought this emo scene was a rejection in large part to the rise of purity culture, etc. Young women wanted to be more than mothers. They’d grown up in broken households and saw their mothers downing antidepressants to get through the day. They wondered why their fathers had abandoned them. They didn’t want to be like their moms. They didn’t recognize the problem was that men don’t care about women, not that their moms weren’t good enough, or were too boring, or whatever.