I don't quite agree with everything. My kids are beautifully mannered and spoken at a restaurant with our friends for example - as many here can verify, but after two aisles of Tesco I'm ready to rip their heads clean off! I shout, exceptionally loudly, at them not because I am a bad parent, but because I know how much it embarrasses them, and that it works. I am not an abusive parent and people need not wonder what chance my kids have with a father like me, as they go about their shopping.
But I do see instances where one might. After a pleasant "business meeting" in Dundee recently, I took my place on the train to return home. I shared a table with a middle aged rather well to do looking couple who said little. At the table across from us was a really charming little girl, maybe six years old, and a couple who I assumed were her grandparents (as they were a little mature to be her parents). She was a real chatterbox and quite amusing.
Conversation at my table was scarce, everyone was listening to grandchild and grandparents adjacent. Just before they got off the train the conversation turned to what time the olds had gone to bed the night before. "I went to bed at 11 o'clock, and you two went to bed at 12". To which 'grandad' replied with "Twelve? It wasn't twelve. You were still looking for your f***ing watch at 1".
It's amazing how easy a "what chance do the kids have" expression can be communicated and received.