I am totally on board with people trying to have good manners.
Here are my proposals.
As a polite parent
I will ensure that I am a good example at all times not just when my kids are looking.
I will make sure to teach my kids polite manners and try hard to make sure they understand why manners are important. No matter how tired I am and no matter how much I do not wish to deal with crap I will never allow my children to be disruptive to the public nor will I allow them to be rude.
I will teach my children to be aware of their bodies in relation to their surroundings so that their limbs do not accidental swing into strangers. And even more importantly I will teach them how to tell when/where that sort of rough play is appropriate so that they will be able to get that energy out and will therefore be too tired to release said energy unto the unsuspecting public.
As a polite citizen of the world
I will recognize that raising kids is hard and that most of the time people are doing the best they know how, with the best resources they have available to them.
I will recognize that for the most part nobody becomes a parent so that they can do a bad job, and as a polite citizen I will behave toward parents accordingly. I will try to remember that even parents and kids who are ordinarily very enjoyable can have bad days, and in an effort to assume the best in people I will assume this is the case and so I will have empathy rather than anger.
I will remember that parenting is a work in progress and so I will try to give kids the benefit of the doubt.
As a polite person I will not respond rudely to a person (child or adult, parent or non parent) even if that person is being rude. As a human I might think rude things, but I will control myself and keep them private to the best of my ability. I will not hide my feelings but I will remember the very wise advice "A spoon full of sugar hep the medicine go down." And I will find effective and polite ways to conduct myself.
To be honest I really don't see this as a problem of kids not respecting adults now a dayd. The problem is that nobody is respectful of anybody these days. How are kids supposed to learn polite behavior from a bunch of adults that act like beasts all the time?
Most parents believe that the child just wants attention and if they ignore them the child will shut up... Most of the time, they are wrong.
Usually a child wants or craves attention/interaction because they actually need to be attended to....shocking I know who would have though LOL. Don't even get me started on this road or we will end up on a long journey about how Ferber came along and told American's that kids cries didn't actually need tending to, but then for some reason some 'genius' decided that the proper alternative to Ferbers 'wisdom' was to totally cave and be at your kids beck and call 24-7 and to totally cater to their every whim and, how now a days when your kid falls of her bike and gets road rash on her nose everyone gives you dirty looks but...sigh never mind this is the wrong place for this and I do not have the time for the pages I would have to write LOL