Nobody is going to turn you away from anywhere on property because of flip-flops, except for Victoria & Albert's. The exact wording of the NO list in 'dress code' is: "Not permitted are tank tops, swimsuits, swimsuit cover-ups, hats for gentlemen, cut-offs, torn clothing and t-shirts with offensive language and/or graphics." You might annoy some people on the internet, but nobody in real life is going to care.