In a forum guidelines, I saw:
Try not to offend other users of the board. (avoid using swearwords etc.) Try not to abuse other users of the board. And please don't create an abusive thread on the board.
I don't see a major difference between "offend" and "abuse", which makes me believe that one of them is redundant. To my non-native eyes, the two are both like "using swearwords to attack someone"
in this specific context. What do you think? Thanks.
