The Federal Court will deliver judgment on Wednesday afternoon on the Queensland MP's defamation claim, launched after refugee advocate Shane Bazzi tweeted the MP was a "rape apologist".
Mr Dutton told the hearing in October he was "deeply offended" by the tweet because it was the opposite of who he was.
The since-deleted tweet contained a link to a 2019 news article quoting Mr Dutton saying some refugee women on Nauru who complained of rape were "trying it on" in order to come to Australia.
Mr Bazzi didn't give evidence but, through lawyer Richard Potter SC, told Justice Richard White he was expressing his honestly held opinion that was based on fact.
The tweet was posted hours after Mr Dutton drew criticism for referring to the "he said, she said" details of former Coalition staffer Brittany Higgins's rape complaint.
Mr Potter argued the tweet may have been insulting and extreme but the opinion was rationally based on those facts.
Honest opinion is a defence to a defamation claim, even if the court agrees the tweet was defamatory.
Mr Dutton has drawn attention to Mr Bazzi's repetition of the "rape apologist" line in a later tweet that added the descriptors "fascist", "f***en scumbag" and "c***".
The member for Dickson, first elected in 2001, is seeking aggravated damages if he wins.
The case is the latest defamation claim made by a federal MP about social media posts.
Andrew Laming took action over tweets by various figures, including ABC's Louise Milligan, made after a Nine News report about a photo the Queensland LNP took.
In September 2020, first-term Nationals MP Anne Webster, her husband and their charity were awarded a combined $875,000 for "disgraceful and inexplicable" claims made by a conspiracy theorist.
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