Why do we say we’re ‘all good’ when we’re not?

Why do we say we’re ‘all good’ when we’re not?

My Mum Suzie was a strong independent woman.  She showed me how to stay strong. “Others have it so much worse than we do Georgia”; “There are so many kids out there that are not good at sport too”; “It doesn’t matter if you got a C.  You can try harder next time”;...