Idc who you are if you are not the parent, grandparent, aunt or uncle you don’t yell at someone else’s kid.

I accept that the majority of parents feel this way,
and that this ethic is both normal and customary everywhere in the West.

I also accept that shouting at any kid is abusive - unless of course it's an urgent cry of "STOP!" or similar to prevent an imminent car accident or some such.

However, I have sometimes intervened to say, "You never get your needs met by throwing a tantrum" -- and it works spectacularly well. The toddler is totally ignoring its parent's exasperated attempts to calm them down (or punish them). But when I as a stranger quietly intervene, it shocks the child so much - that a stranger is on the parent's side - that they shut up and actually listen. It's amazing how it totally transforms the situation. And I wouldn't be surprised if it had turned out to be a moment of dawning understanding for the kid.

Kind of depends on the circumstances. Some kid about to run out onto a high speed heavily used roadway? I might yell at him if I can't reach him to stop him from being killed.

If the parent can't control the kid SOMEONE has got to yell at the brat -- AND probably at the irresponsible parent, too..

In general I agree. I might also add that even if you’re a grandparent, aunt, uncle or whatever, the parents are the ones to decide for their child so you can politely STFU 😇

Even the grandparents, aunts, and uncles, should not scream at them.