This bothers me too, because I can't really do it, and it hurts my feelings when friends do it to me. Even if it's only a sign that they're close enough to me to do something like that with.
I feel like I'm always so sincere, and take things very sincerely. And that it prevents me from having social skills that I don't like to and can't really make fun of people. There's a lot of nuances in people talking communicating that seem so mean but aren't supposed to be. And I don't like it and it makes me feel self conscious that I don't want to insult or be mean to people I like, and that it doesn't make me happy if they insult me.