My feet aren't the problem, silly! They're safely laced away in my "Airplane Flyin' Boots." My point was that I'm not taking my chances with anyone who decides that the cramped interior of an airplane is a dandy place to kick off one's shoes and waft one's toes about the cabin. (Not that this is what everyone with sandals does. It was just an amusing, albeit somewhat troubling, mental image.) In short: passengers wear shoes if they're flying with me. Plus, as others have said, it's really a safety issue.
Oh, I wasn't implying you specifically.