I have read a LOT of similar threads recently and feel compelled to offer my unique opinion.
1. Most builders, people who have literally stuck with one activity for YEARS, are usually a bit on the anal side, myself included. I read a lot of frustrated comments on here and other sites that sound more like unrealistic expectations of an anal builder for an uneducated populace.
2. Most builders (not all, but most) are older. Many have long ago forgotten what a 3-5 year old is actually like. I have little kids and taking a 3-4 year old to an airshow or fly-in would be sensory overload. A 3 year old is going to "hang on a prop" if left alone. At that age it is not a training issue, rather a "herding" issue.
3. The general populace has NO IDEA what they should or should not do around aircraft and most people do not really pay attention to signage. Right or wrong, we have to constantly monitor and EDUCATE the masses.
4. Human nature 101 - if you yell at, publicly confront in a perceived belittling manner, make someone feel dumb or inferior, etc they WILL react negatively.
If you want to show off your plane, part of the deal is you are going to have to take on the role of proactive educator, ambassador, etc. and there is a very real risk that my son is going to chew through his leash and be standing on your wheel pant while I frantically search in every nook and cranny for him. And when I finally find him, relief warring with frustration and anger that he ran off, your snipping comments about my parenting and "kids these days" is not going to elicit a positive response from me. I have repaired more kid inspired damage to my cub in the past 4 years than you would care to hear...and I have obedient and respectful kids that are growing up around aircraft.
I welcome all of the snotty kids and stupid adults at any fly-in. Hopefully they will leave educated, enchanted and inspired. When the time comes that I cannot cope with this reality, I will leave my plane safely ensconced in its cavern...exiting only for short local flights.