Luis, the problem is not so much in what is said, but more in how it is said. When it is obvious that one is mucking around it takes the venom out of it. I have to admit though that it is not always easy to put across with written words. In verbal comments, face to face situations there are the mannerism + the other non-verbal clues associated with discussion, no such luck when posting comments, even the emoticons are not enough!