25 years ago in one of the most liberal cities in America, Gainesville Florida My wife and I and our 4 kids and a friend , his wife and 4 kids were in the grocery store. All of our kids were well behaved in stores. My friend and I were off in one direction and my wife was off in another. K. had all 8 younguns. When the rest of us drifted back a crowd had collected around K and were berating her terribly for the horrible things she was doing to The Planet. K was smiling and I heard her to say as she patted her stomach,"I'm pregnant. It's twins!"(she lied) The security guard showed up about then and ordered everyone to go about their business.
It's at this point that I tell people what to do in the most rude terms possible (really, I'm an easygoing sort, but I have a real ability to be viciously cruel when it's called for). My wife would be worse.
Right now, we have 13-month old twin boys. In about four weeks, we have another on the way. Frankly, we haven't had any such attitudes come up at all, just people who laugh and roll their eyes about how busy we'll be (the obligatory line when they see the twins is 'Boy, you've got your hands full!' We hear that 9 times out of 10.).