Try another option.

The store can choose who they wish to do business with but not treat customers less favourably because of their race.

Not bad, but try another option.

It might be good for business to serve everyone consistently but there are no laws saying stores must do this.

Dulcie may choose never to deal with that shop again.

Good answer.

Racial discrimination happens when someone is treated differently from another on the basis of their skin colour, nationality or ethnic origin.