An Australian vegan activist claims a Perth eatery's ban on vegans is discrimination.

Fyre Restaurant has announced on social media it's banning all vegans - for mental health reasons.

The beef kicked off after an unnamed customer complained at being charged $32 for a bowl of vegetables, after calling ahead to request a vegan meal.

Advocate Tash Peterson says the customer's complaint was reasonable.

"She called up a week ahead of time and was agreed by the chef to make a vegan option, which wasn't complied to when she arrived."

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