Somebody had better teach this young girl manner

Today’s lesson is about manner

I was browsing the web when I stumbled upon this picture, it’s agonizing, sad, embarrassing and upsetting me. I wonder if her parents teaches her to distinguish right from wrong. Does she know the meaning of this impolite gesture? Does she realize how other people would react to this? I’m sad and embarrassed for having to see this. How could a girl, so little may show such a bad attitude towards an old woman? Will somebody please explain this?