Most people who complain about children are usually Empty nesters. Children remind them of better times when they were young and had children, and it subconsciously makes them upset. It’s better for them to be out of sight out of mind. The whole “children should be seen but not heard” generation.
I will sometimes tease the kids by asking "Didn't your mommy ever tell you not to talk to strangers?" to which they will often reply something like "She's not a stranger, she's a nice lady, just like my Nana!" Mrs. Vigilanteman, of course, eats it up and has more fun than the kids.