I saw this done on another show a few years ago on TV. This womane dressed put fat person outfit and pretended she left her keys in her car - She kept waiting and NONE WOULD HELP HER! Men would pass her by or say NO they couldn't help her. When she got out of her fat outfit - she had NO PROBLEM getting men to help her open her car door.
Many people simply don't respect those that have obesity issues. Somewhat cruel I suppose but then again, would you think highly of an chronic alcoholic or druggie or gambler? It is human nature to judge others whether anyone wants to admit to it or not.