Just got off the bus with DC 22months. On the bus, sat in his pushchair he said to me 'I done a poo' I reply 'ok sweetie, we will be getting off the bus and home in a few mins'
Sat quietly again I hear a lady in the seat behind me tut and say to the lady next to her 'why do parents not teach their children to not say such rude disgusting things' I ignored it thinking, surely not talking about us? He's 22 months and it's not rude or disgusting, is it?? 
She then says 'my nappy needs changing would have done' so this time I know she is obviously talking about us so I turn to her and say 'he's just a little boy, he's not rude, that's ridiculous. Please keep your opinions to yourself'
She stays quiet for the next few minutes but just before we are about to get off the bus I hear her tut. I look at her to give her opportunity to tell me what the problem now was but she doesn't say anything, just stares! The women next to her looked embarrassed.