I was at a train station in Portugal last week. There was a young child, I'd guess aged 3-4, crying on the platform (for context, although I didn't see I will assume the crying was related to a tantrum of sorts). A woman came up to the child, dragged them up by one arm so they were dangling, slapped them around the face with the force you'd hit an adult, and threw them a metre away.
I was shocked to have witnessed such treatment of a child because obviously here in the UK that absolutely is child abuse, but I wondered whether, somehow, that could be relatively normal in another culture. Given how publicly it occurred with no one seemingly batting an eyelid, it didn't seem like a unusual sight.
AIBU and should I mind my own business or is it reasonable to assume that's not normal treatment of a child anywhere?