Mr Latham gave evidence to a tribunal on Wednesday after being accused of vilification and workplace harassment by NSW independent MP Alex Greenwich.
The case centres on a sexually explicit tweet the Federal Court previously ruled as defamatory and subsequent media appearances made by Mr Latham, who sits as an independent in the NSW parliament's upper house.
The firebrand politician did not hold back in the witness box, delivering a lengthy tirade in which he accused Mr Greenwich of suing to try to silence him and being unable to take criticism.
"If (Mr Greenwich) has a leak in his roof, he would stomp around his house and say 'Bloody Latham, bloody Latham'," he said.
The former state leader of One Nation delivered his rant after the tribunal let Mr Greenwich tender a tweet sent by Mr Latham.
The post labelled the tribunal hearing "an absurd proposition" with Mr Latham labelling his previous criticism of Mr Greenwich as "100 per cent true".
It was evidence the initial post, sent in 2023, was continuing to cause Mr Greenwich harm, his lawyers argued.
Mr Latham's lawyer Zali Burrows earlier tried to tender late evidence, including Mr Latham labelling his rival a "spoilt child" along with other references to his father.
Senior tribunal member Mandy Tibbey accepted only a limited amount of the affidavit after questioning its relevance, adding: "I don't really see how this helps your case."
The tribunal also knocked back a request by Mr Greenwich's team to continue updating evidence while preparing final submissions if the alleged harmful tweets continued.
Ms Burrows asserted it risked the matter becoming "never-ending".
"It is desirable there is a cessation of hostilities between the parties," Ms Tibbey, the tribunal member, said.
"Mr Greenwich would very much like it to stop," his lawyer Prue Bindon said.
Outside court, Mr Greenwich briefly outlined his desire to move on from the matter, adding he was "really relieved" the two-day hearings were over.
The Sydney MP previously told the tribunal his rival had "an abusive obsession" with him and said the tweet had "diminished, demeaned and dehumanised" him.
The online sparring match between the two politicians followed violent protests outside a church in Sydney's southwest, where Mr Latham was giving a pre-election speech in March 2023.
About 250 mostly male counter-protesters violently attacked police and 15 LGBTQI protesters.
Mr Greenwich, who is a vocal advocate for the LGBTQI community, was awarded $140,000 in damages plus an estimated $400,000 in legal costs in the Federal Court suit against Mr Latham in 2024.
He sued Mr Latham over the tweet sent days after the state election, which described a sex act in explicit terms.
It came in response to a post quoting Mr Greenwich describing him as a "disgusting human being".
Mr Latham has been embroiled in several recent scandals, including taking photos of women MPs without their knowledge, for which he has apologised.
The parties are due to hand up written submissions by October 29.
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