Oh dear, how sad ..
Those of us of a certain age will remember fondly the sitcom 'It Ain't 'Half 'Hot Mum', set in India in the last few months of the second world war. It featured a concert party from the Royal Artillery and their rather gruff Sergeant Major, played by Windsor Davies.
His catchphrase, used when a member of the concert party had an issue was, 'Oh dear, how sad, never mind'. He said this in a complete monotone, showing that he really didn't give a poop!