sequins do not a formal flip flop make

i know i may sound like an old fuddy-duddy here (use of that phrase alone is probably enough), but when did it become socially acceptable to wear flip flops with one's evening dress?

while waiting in line at a restaurant last night, i counted no fewer than eight girls in prom dresses and flip flops. i'm all for comfort, but seriously- this was right up there with that girls' lacrosse team that wore flip flops for a photo op with the president a year or two ago.