An Irish cafe owner's comments about vegans has sparked an online war, resulting in a total ban on vegan customers.

Paul Stenson, owner of The White Moose cafe in Dublin, provoked anger from vegans after posting a blunt message on the eatery's Facebook page.

He said: "Please do not waltz into our cafe with no advance notice and look at us as if we have ten heads when you realise that there aren't 50,000 items on our menu that suit your idiosyncratic dietary requirements."

The remarks didn't sit well with subscribers to the animal-product free diet. One commenter said the post was rude and "pretty childish and unprofessional".

In retaliation, vegans from all over the globe began posting negative reviews about The White Moose online.

Stenson hit back, saying: "I'm loving all the negative reviews we have been receiving ... by seemingly every vegan who exists on planet earth."

"The reality of the situation is that 100% of these people have never been in our café, and are writing these reviews because they chose to take offence to one of my posts relating to the sense of over-entitlement that vegans seem to have."

In a bid to counter the negative reviews, he offered a prize draw to anyone posting 5-star reviews.

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However, the criticism continues to escalate and Stenson received over 1000 negative reviews and sparked a Facebook dedicated to boycotting the cafe.

In defence, Stenson created a meat and egg-laden breakfast special.

He eventually decided to ban all vegans, using threats of physical violence.

The abuse continued back and forth between Stenson and angered vegans, some of whom even approached Irish police about his threats.

Non-deterred, Stenson posted a faux apology to vegans:

The war continues and vegan protesters have begun picketing outside the cafe's premises and continue to bombard social media and review websites with negative comments.

This is not the first time Stenson has reacted to customer criticism by lashing out online.

The Belfast Telegraph reports the cafe posted CCTV footage of the customer eating after she posted a negative review online.