In reply to Neil Williams:
shoe fitting areas are public areas not conducive to confidentiality and the reason is it's really unusual for anyone to care, foot size is not a confidential issue, that said, and at the risk of repeating myself, if he really feels done down, picked on or otherwise abused he should continue his complaint.
however when I asked G. Tiger if he felt offended he answered
<No - but I don't believe that anyone should have any physical difference or anomaly highlighted like that in public.>
he did felt it was inappropriate
Personally I would just tell the bloke in question and not involve his boss - chatting's always good and there is often a simple way forward, educate not castigate