It is almost always "child free" people that are massively disturbed by even the quietest child noises. I can only speculate as to the (obvious) reasons for this attitude which gives me some level of compassion and even sorrow for those people.

You're being gaslit by most of the comments here but you're not imagining things - there's been a huge shift from an attitude of "children, even other peoples' children, are our future so it's reasonable to tolerate some noise from them" to "children are a dirty loud nuisance that must be stopped".

Again, the reasons for this seem obvious to me but you're an asshole if you point them out explicity.