god, never look at yourself in bright light. I am by no means a size zero, but i like to think I have an ok figure. One night, when in a club's toilets, I was stood side-on at a mirror with a strapless dress on using the hand-drier and when I looked to the right, my arm was disgusting, all dimpled and fat-looking. I showed my friend the effect the mirror had and it did the same to her otherwise slim arms!
I think maybe club owners think you'll be too drunk to notice, or think it'll take you down a peg or two, or drink more to get over the anguish lol. Dont worry, nobody looks good in bright light!