Well, think again.
I was at the grocery store today and saw some guy (a different one) with sandals and dark socks up to his knees. I find this look very refreshing. It's a not-so-subtle way of saying "I don't give a shit what you think of me and how I dress, fellow grocery store patron." In fact, I'm very close to making this a wardrobe staple, with one slight alteration meant to add a little panache. I think I'll wear my socks OVER the sandals. I bet I'll be the only one doing it.
Plus, just imagine how annoyed Megan will be! Win-win!