Slight tangent (my brain goes weird ways)
But I think the noise is different for tennis (though agree equally impacts both players)
I’m basing this brain fart on the premise that almost all specifically aiming with equipment activities are silent - Tennis, Snooker, Darts, Shooting etc. So there must be something in that, somewhere.
I feel sorry for Emma only because she was made to look out of order for pointing out that it needed stopping - that’s the umpires job.
As for the umpire not wanting to embarrass the parents - no offence but sod that! Who said parents can never be embarrassed? They brought their baby somewhere wholly unsuitable, swaddled it up in intense heat and then failed to respond to its “get me the hell out of here signals” inconvenienced top level sports starts and an entire crowd. Frankly a bit more shaming of these types of people is in order.