So today we were in a car park and a man that worked there came along to help us and have a general chat. As he was leaving he said enjoy the rest of your afternoon.. to which I responded you too! DP then scoffed "he's at work" I said you do know not everyone hates being at work? Some people's jobs give them a purpose. He said "I suppose" so anyway I now feel like a total idiot and am slightly cringing thinking about it 
WIBU to tell the man to enjoy his afternoon even though he was at work?