I should preface this post by saying this is lighted!
I have always been taught growing up that is rude and you can't walk into a supermarket drinking a costa/Starbucks drink. I remember standing outside with my Mum when I was younger rushing to finish my drink to put it in the bin outside the supermarket before going in. Now I am in my 20's and an adult I have still have not walked into a supermarket with a shop bought drink in my hand. Maybe I should try it one day?
Was my Mum correct in what she instilled in me?