A customer at Sydney's Barista Haus Gladesville said they were offended by Catholic rosary and accused the owners of discrimination.
The owner Ramis Amanoel told the customer, who was a regular, to take his business elsewhere.
It is not clear whether the man is religious.
Ramis Amanoel, who runs Barista Haus Gladesville in Sydney's north-west, said a male customer claimed it was religious discrimination.
He told Daily Mail Australia: "He started losing his mind about the rosary.
"He was saying he was highly offended and shouldn't be subjected to this."
"He is a regular customer who has been coming in for ages.
"I have no idea why he did it. The anger he had towards it was unbelievable.
"It wasn't a one-off random bloke. He comes to the shop every day, he is a normal person."
Co-owner Mark Moawad told the customer they would not take down the rosary: "We said 'If you don't like it, you can leave'.
"So he took his money back and went," said Mr Amanoel.
