I don't see anything wrong with the picture.

Some people don't have a problem walking in heels for hours.
Maybe they were going to lunch/dinner and planned to change later.
I know plenty of women(myself included) who wear heels with jeans. All of my dressy boots have heels.
OP, I think you intentions were good, but I'm willing to bet things may get nasty here.
I wonder what would happen if someone posted a What The..... picture of:
a 10 year old in a stroller
a child on a leach
a heavy person eating