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It's very easy to get distracting preparing, cooking, or setting up food, get a little on your fingers, lick them, then continue without washing your hands. It's also a bad habit to taste test a dish and then continue to use the same utensil after it leaves your mouth. Let's not even start on the topic of hand feeding food to a pet then return to your cooking without washing! I suppose if your immediate family is accustomed to these practices then no one will complain, but please reserve these practices to the privacy of your immediate family, and spare your invited guests!
Aside from the "YUCK" factor of double dipping and finger licking, proper cooking and "eating etiquette" (which I'm defining as something different than dining etiquette) prevents the spread of germs. No one wants to go home from a dinner party and wake up with a bad cold, or food poisoning. Please remember to wash your hands, use separate utensils, and set out small plates and ramekins to allow guests their own portions of dipping sauce.
What is your biggest eating etiquette complaint?