Many jumped to his defence, with some even saying they owned the same sweater.
"But this sweater is actually so cute and I need it," one person wrote.
But others agreed with the staff and said they weren't wrong.
Graham's is among many receipt or label mishaps exposed by eagle-eyed customers.
In September a US woman said she was made to feel "uncomfortable" after discovering a racist slur on the receipt for her takeaway order from a local Mexican restaurant.
Instead of featuring the customer's first name, the bill reportedly listed the N-word.
Last month a young mum hit out at one of her favourite cafes after a worker left a nasty note on her receipt.
Kimberly Sze was stunned to find she had allegedly been overcharged – and her daughter had also been insulted with the words "Fam w (sic) the terrifying kid" printed at the top of the document at Coffee Supreme on Christchurch's Welles St.
And last week a police officer who picked up a Starbucks order for his colleagues during Thanksgiving was stunned to find a cruel insult printed on the drink label.
That incident occurred in Oklahoma in the US when an unnamed officer visited the coffee chain to pick up orders for a number of other cops who were working on the holiday.