Okay, so for me the fail is not his response to your question of why he should stop kissing your hand. The fail is that he asked at all. Because, "Stop [doing physical thing to me]," should be answered with, "Okay, I'm sorry, I won't do it again," not, "Why?" WHY? Because it is my body and not your body and I told you not to AND THAT IS ALL THE WHY YOU NEED.