With only posted words its hard to judge how someone will take 'sledging'. If anything is posted in a online forumn it shall be expected that you are not always going to like what you read as ones opinion differs to another. If offence is taken the telling someone to "f@ck off" is not going to deal with the issue. Then it shows that person's inability to deal with threads or immaturity to comprehend what is being said. To say it frank "people in glass houses shouldn't throw stones"