I still think there is a healthy amount of teasing and there is too much teasing. People can tell when it is too much. Often people who were brought up in an environment with pervasive teasing (typically from siblings) do not have a sense of "how much is too much" when they become adults. The continue to tease beyond the point that is sensitive and healthy and fun - they are not tuned in to the impact of their teasing. Others notice it though - like wives. Typically though the over-teaser dismisses such concerns.

This guy says "biggest discussion my wife and I have is whether I tease them and push them too much". I read that as someone who is not in touch with the fact that he is over-teasing, and is not effective at putting himself in the shoes of others to see and feel what that teasing is like.

When adult tease, they are carrying on the behaviour they learned in the family situation as children. They have not learned that teasing is a behaviour either best left in childhood or strongly curtailed/regulated - it's not an effective way to relate to people if you are an adult, does not grow relationships. Except perhaps as described in the case of this article where a bit of teasing with the kids is fun. A bit.