] There are many people, myself included, who feel that teasing is very often a sign of repressed hostility or anger felt by the one who teases. Teasing becomes a socially acceptable way of venting this anger (snip)

I'm not sure I would agree that all teasing is a sign of repressed hostility or anger. I think there is also lighthearted teasing which is a way of communicating humor with another. The difference lies in how the person you are teasing reacts. If that person gets angry, teasing is no longer fun. I think P&P gives us a great example of the two types of teasing. Mr. Bennet enjoys teasing his wife and daughters. With Lizzy, this tends to be lighthearted teasing as she understands him and his sense of humor. With Mrs. Bennet, it may start out this way, but her lack of understanding and her love of "feeding her nerves" turn his teasing into vexing. We see Lizzy teasing people too, like Jane and Charlotte, but her teasing tends to be the lighthearted variety. It is with Mr. Darcy that her teasing starts bordering on anger, because she does not like him and is often angry with him.