This was closed as too broad, as it initially mentioned three different situations. When I cast the last close-vote this morning, that was already edited down, BUT as I pointed out in a comment, there was some critical information lacking...
It doesn't include culture tags. We don't know what culture the OP is living in, and more importantly, we don't know in which culture licking spoons is acceptable behaviour.
So, there's no way for me to answer this question, since I don't know who I am going to be telling 'don't lick the frigging spoon, that's disgusting'.
What culture is the spoon-licker coming from? What should I keep in mind, would my Dutch directness offend the person and should I thus refrain from answering?
Can we re-close this question until the OP has added this info?