The self-proclaimed “professor against political correctness” lashed out at Trudeau on Twitter in a public Christmas Eve outburst.

In a December 23 Twitter post that appeared to be aimed primarily at Canadian citizens, Trudeau said: “If you’re taking care of some last-minute Christmas shopping this week, here’s something else you can add to your list: a booster.

“If you’re eligible for one but haven’t gotten it yet, please, do so now. And if you don’t have your first or second dose, now’s the time to get it.”

But Peterson took issue with Trudeau’s booster plea and shared a defiant quote tweet of the Canadian Prime Minister’s comment on the social media platform.

It read: “Up yours @JustinTrudeau. Seriously. You’d have to kill me first.”

As of Sunday morning, Peterson’s comment was liked more than 26,400 times and was retweeted on more than 3,955 occasions.

Peterson, a darling of the modern conservative movement, has railed against restrictions that have been placed on Canadians in a bid to curb the spread of COVID-19, including vaccination requirements for flight travel,

He previously said during a November appearance on the conservative talk show The Rubin Report that COVID-19 policy was “being driven by people who are more afraid than they should be.”

Peterson himself tested positive for COVID in August 2020 while he received treatment for prescription drug dependence in Serbia.

He has since been vaccinated against COVID-19, although he said the reason behind his decision was for the Government to then “leave me alone.”

Speaking to The Rubin Report host Dave Rubin, Peterson said: “Look, I got vaccinated and people took me to task for that, and I thought: ‘alright, I’ll get the damn vaccine. Here’s the deal, guys, I’ll get the vaccine, you f***ing leave me alone.’”

“And did that work? No. So, stupid me you know. That’s how I feel about it. So, now I have to get tested for COVID when I come back into Canada. I have to get tested before I leave Canada.”

In the same interview, Peterson said he did not believe evidence that vaccinated people were less contagious than the unvaccinated was “very compelling” and that the push to get children inoculated against COVID was “absolutely reprehensible.”

Peterson’s claims about the evidence regarding the transmissibility of vaccinated people go against research carried out by Harvard T.H. Chan School of Public Health.

The study, published online in the New England Journal of Medicine in November, claimed the findings gave a deeper understanding of how breakthrough infections occur.

Stephen Kissler said in the study: “Our work provides the most detailed information to date about how viral concentrations change in the body across the full duration of SARS-COV-2 infection.”

Other studies produced before this research speculated vaccinated individuals did produce similar levels of virus as unvaccinated individuals, according to the university’s publication The Harvard Gazette.

Newsweek has contacted Peterson for comment.