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popmol Then you don't understand it. You can't force anything like this on people. Just like you can't teach people tactfulness, because different people have different tolerance levels. There are people who can predict what they shouldn't tell other person if they don't want to touch them and there are people who have no idea. I know about three people like this and had enough time to realize that it's not their fault that their EQ is lower.
But personally, I find it sad when a person knows that it will most probably offend a person next to them and still tells it and makes excuses that it's just a joke. Especially if these people meet for the first time and don't know each other and the one who is offended can't even leave because she or he will be seen as overacting one. (team building party for example, informal business meeting...).
I have just a humble wish that people would be tactful enough to know when it's appropriate to tell certain things. Especially in teacher-student, employer-employee relationships, where you can't defend yourself.