You walk into a store that sells candy, cookies, ice cream, donuts, or some other delicious but unhealthy snack, with the intention of buying and consuming something. The person working behind the counter is overweight. Not morbidly obese, but definitely not just a little chubby, either.
Does this make you think twice about buying the product?
Would you make fun of the person, out of earshot? (e.g. "Ha ha, looks like someone's been sampling the product!")