I don't think IABU (although naturally I know many would!). In fact I am really only posting this to get it off my chest. In IKEA with 2 DS's. THe younger, just turned 2, was playing at one of those little touch screen children's toy things they have dotted around the store. I wasn't looking at him, but he was resting against my knees. Apparently he pushed a little girl, aged around 4, who was also standing at the screen. Her mother, instead of simply saying to him "don't push" or saying to me "your DS pushed my daughter" started doing that really fucking annoying talking through the child thing, "Shall we go somewhere else, as SOME CHILDREN obviously have no manners" blah blah blah. So I asked her what she was talking about, she told me DS had pushed her daughter.So I said, well, why didn't you tell me instead of making snidey comments, I'm standing right here and I would have said something but I didn't see him do it. To which she said, "well perhaps you should have been watching him, he is a very little child you know and needs watching" (but not too little for sarcastic comments apparently) ffs I was standing in direct contact with him, whilst writing my sodding aisle and locations down! We went back and forth for a few minutes and then she backed off, still talking though her daughter "we'll put you in the trolley, as WE KNOW you're too little to be running around, don't we."
I'm not precious, I know my children, like all, can be naughty, and I would never care about other adults puling them up on their manners, behaviour etc, and we consistently do it ourselves. But what really annoyed me was the whole passive agressive doing it through comments to her child rather than simply saying something directly - even though I clearly would have heard, she seemed very taken aback when I challenged her.
It is all something of nothing, obviously, but this has annoyed me all day!