Child screaming

My friend has a grandchild who is always screeching and screaming when out playing. I have witnessed it at family events. Her parents never say anything, even when other people are wincing at the sound. She has no special needs, just an excitable child.

Apparently a neighbour recently came out onto the Green where they lived and asked this child to please keep the noise down. Daughter and my friend have taken huge umbrage at this. I am expected to sympathise with my friend but, quite frankly, having to listen to this child near my own home day in, day out, would drive me mad.

AIBU to think my friend and her daughter, and of course the child's father, should stop pandering to this and teach the child to show consideration to others. She is 9.