Have a nice day now.
It's kindly meant, but one of the first times a shop assistant said it to me was five minutes after my sister had been told she had cancer. I bit my tongue hard in order not to snap at the well meaning girl behind the cash register.
And every time I hear it, I am back in that shop on that day.
I am afraid we can't get people not to use euphemisms for death - I wrote the notification of my husband's death stating that NN had died on 1. November after a short, serious illness.
It had been carefully edited to read that NN passed away etc.
I did not take it up with either the undertaker or the editor, but I would have preferred them to use what I actually had written.