Hello.
Just a quick one, really. My 5 year old never used to say this to anyone considering it's never really said in the home - "use your common sense!"
I asked him, "who says that?," to which he responds "[Teacher's name]."
Do you think that a Year 1 primary school teacher should say things like that to 5/6 year olds, considering how rude and abrupt it is to say something like it? Personally, I find it quite ridiculous considering the fact that not even DS15's Year 10 secondary school teachers say things like that.
Cheers.