Not so lucky
I have no idea where the tradition came from of a bird pooing on your head being good luck. I can only imagine that it was invented by a particularly cheeky village joker to wind up his friends, and it got out of hand. There will always be the person in your group who cheerfully lets you know you should be grateful for the droppings.
At least this guy’s response wasn’t as annoying. Rather it was incredulous that the girl knew a bird had pooped on her head but hadn’t bothered to do anything about it. Also, she’d then wandered around Walmart with him for a while. I would definitely be questioning her understanding of hygiene.