If you were in a supermarket with your DC and there was a toddler screaming the place down and his Mum, who was with two friends, was shouting at him:
"Shut the fuck up, you fucking little bastard"!
???
I am ashamed to say I said nothing as I was on my own with my DC and she was with her friends and they looked like they'd "have you".
My DD was near her DS and I did say "Say hello J" and DD said hello and then we went on our way