The concept of grossness is a product of one's perceptions, learning and experiences, and is often perfectly illogical. For example, chewing your food, spitting it on the plate, then taking the chewed up muck back in your mouth would be gross to many people. Logically...that came from your own mouth, and a short time out of the mouth would not make the mush any more bacteria-infested. There are other times when the assessment of a situation is judged more by its "grossness" than by its real disadvantages.
Still, some things are still nasty, no matter how much scientific fact one has to the contrary. For example, the 5-second rule. Sure, you could pick up and eat candies that fell to the ground and laid there for a couple seconds. Most probably wouldn't, because it'd be nasty. Same with escargot. I wouldn't eat snail by any name...simply because it's gross!
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