Australia's race discrimination commissioner has slammed a Muslim businessman for suggesting the white race will die out in 40 years.

Halal Certification Authority president Mohamed Elmouelhy said Muslim men needed to 'fertilise' Australian women and 'keep them surrounded by Muslim babies' because Australian men were too busy smoking, drinking beer and injecting drugs to procreate.

However, Race Discrimination Commissioner Tim Soutphommasane said such comments may contravene section 18C of the Racial Discrimination Act, which makes it illegal to offend, insult, humiliate or intimidate a race of people.

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Muslim businessman Mohamed Elmouelhy (pictured) says he was being a larrikin when he said Australia's white race will die out in 40 years

Race Discrimination Commissioner Tim Soutphommasane (pictured) has expressed his concern to Mohamed Elmouelhy about his racially provocative remarks

Halal Certification Authority boss defended his comments (pictured) about Australian women needing Muslim men to fertilise them, saying it was all tongue in cheek

'Our society is diminished by provocations based on race,' he told Daily Mail Australia on Monday, as he returned from leave.

'I have expressed my concern to Mr Elmouelhy.

'There is no place for any expression of racial hatred or hostility in our public debate.'

Mr Elmouelhy last week told Sydney radio presenter Chris Smith he was just being a 'larrikin'.

'I'm an Australian, Australians are known for being a larrikin,' he told 2GB's afternoon show.

Mr Elmouelhy said his Facebook post, calling on Muslim men to 'fertilise' Australian women instead of 'beer swilling, cigarette smoking, drug injecting' Australian men, was all tongue in cheek 'from beginning to end'.

2GB's Chris Smith (pictured) questioned Mr Elmouelhy's motives behind the Facebook post

The halal boss told 2GB his post was only aimed at 'Australian bigots', not all Australians.

'I'm only calling certain Australians bigots,' he said.

'I am writing to specific people who are bigots ... the thousands of people who assault me on a daily basis, insult my religion, insult Muslims, derogatory things are said every day.'

Mr Elmouelhy's Facebook post was in response to Hebrew University in Jerusalem which published research showing sperm counts in men from Australia, New Zealand, North America and Europe had declined by more than 50 per cent in less than 40 years.

'Your men are a dying breed, Australian women need us to fertilise them and keep them surrounded by Muslim babies while beer swilling, cigarette smoking, drug injecting can only dream of what Muslim men are capable of,' he said.

Mohamed Elmouelhy says Australian men are too busy drinking beer to be future fathers

Halal Certification Authority president Mohamed Elmouelhy weighed into the sperm findings

'Muslims have a duty to make your women happy.'

Mr Elmouelhy said Australia's white race 'will be extinct in another 40 years' if the country is 'left to bigots'.

The Muslim businessman called on these 'bigots' to kill themselves or plan to die.

'Because you are declining, better go choose a plot for yourself at your local cemetery,' he said.

'If you can't afford it, commit suicide. It is a cheaper alternative for bigots.'

The Muslim businessman said drug use among Australian men would see white race die out

The Hebrew University-Hadassah Braun School of Public Health and Community Medicine in Jerusalem found male fertility had sharply declined by 52 per cent, between 1973 and 2011.

Mr Elmouelhy's post was written just days after he predicted more non-Muslims in Australia would be eating more halal food than ever.

The 2016 Census revealed that Muslims made up 2.6 per cent of the Australian population, up from 2.2 per cent in 2011.

Australia's Muslim population soared to more than 604,000 people, overtaking Buddhism as the most popular non-Christian religion, and marking a significant jump from 341,000 a decade earlier.