What is defamation?
Defamation is a false statement (written, visual or verbal) published to a third party with the intent of causing serious harm to an individual's reputation. It is covered by the Defamation Act 2013.
Lord Atkin described defamation during the case of Sim v Stretch in 1935, when he summed it up as: "a statement which tends to lower the plaintiff in the minds of right-thinking members of society generally, and in particular to cause him to be regarded with feelings of hatred, contempt, ridicule, fear and disesteem...". This summary still applies today.
If you believe the statement made against you, and published to a third party, has damaged your reputation, then you may have a claim.
However, if the statement was merely insulting, vulgar or offensive but did not harm your reputation, then a court would not rule in your favour.