I know I know I shouldn't judge and it may have been a once in a blue moon thing and never ever happened before and will never ever happen again but the other day I was in Primark and a girl of roughly 3 years old was being carried around by her mum. The girl then pulled her mum's hair and her mum pulled her hair back and said "See, it hurts doesn't it."
Do lots of people do this and it is seen as acceptable because I've never seen it before?