I can't stand the double dipping either! I've done it myself, but only when the food is just for me - but I won't do it if I'm serving something for others... I just end up with a sink full of spoons instead
We had someone at a taster session at group ages ago who went round the table with the same spoon trying each dish... it took all I had to not turn round and call her out on it!
I don't like watching someone pull the rest of the meat off a chicken after a roast. I can easily do it myself, but I can't watch someone else do it.
I hate seeing people cook mince but don't drain any fat off (when they've not used the really lean stuff) I've never liked the fatty ring around the plate of food. Also, cooking it in water... seeing the fat floating around the pan isn't nice either