I just want to put this out there: internally I'm actually kind of a selfish jerk, a self-righteous dick. But despite thinking jerky, dickish things I don't go around saying them. I spend all day being a decent human being to people, so a little ragewankery is a nice change of pace.
And I firmly believe we need to hate shitty things that people do and not who they are. In this case it's a difficult thing to separate because a parent doesn't stop being a parent, which means parenting is both a thing they do and a thing they are. Part of parents' defensiveness may stem from parenthood being as much an identity as an activity; any complaint about the parenting is seen as a personal attack instead of a comment on a shitty thing that was just done.
You'll see this when a parent, for example, screams in her kid's face or yanks on his arms to get him to come along. Any comment on that elicits a response of "Don't tell me how to raise my kids" which is a miscommunication. I'm not telling you how to raise your kids. I'm just saying that one thing you just did was horrible.
Similarly, when you're a boss, you'll cause morale to plummet if your criticism is "Why don't you do your job right" vs. "Why did you do X thing in this way".
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As for calling it a verbal lynching, and bringing in other racism-related language, that's a bit off track. Again, I'm not talking about parents in general, or technically even bad parents, but bad parenting. But let's go with it: let's say I'm verbally flogging humans in general for doing a shitty thing. I'm ok with that.
Again, we're in a tiny corner of the Internet that's hardly compulsory to visit, and I'm not calling out specific people. I'm complaining about antisocial behavior in a flagrantly antisocial way, partly because I rarely ever do it and partly because sometimes you just gotta say Fuck to get your point across.
Let's say I were complaining about something else that's anti-social behavior, like adults taking advantage of elderly folks who can't resist - psychologically, manipulatively, but not illegally. I doubt there would be anyone standing up in defense of the douchebag bleeding his granny's savings dry or telemarketers getting her to enter tons of worthless sweepstakes. There's a defense of parents going on here for some other reason.
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I'm sure criticism could be leveled against my rant. And it's probably deserving of some. And I'm ok with that too.