What I had in mind was a mother saying "I never loved you" to her kid. Or a father suggesting it's the kid's fault that Mommy left/died/drinks. Or telling somebody they're a loser and will never amount to something. Or that they're ugly and unloveable.
When you go to the grocery store and you see a mother be really awful to her kid (or dog), you don't call the police (and you couldn't, unless it was physical). But instead you give them a dirty look-- you use social pressure instead of legal pressure.
And we do this because the legal system isn't well equipped to handle such injustices (these cases would often be heresay, too expensive, too long/convoluted). But the social-pressure system has its own limits, and gets abused too.