A pizza restaurant posted CCTV images of a couple, who complained about waiting for their food, and trying to do a runner.
The row erupted when Arron May and his partner got fed up with the wait and were unhappy with their "greasy and very fatty" pizzas.
Mr Pizza, in Derby, without paying but decided to settle for the full bill – just under £ 30 – because they were not sure of their rights.
But after they left, restaurant boss Antonio Palermo posted the images were "very rude" and "did not want to pay" for their meal, DerbyshireLive reports.
He claims the restaurant did not do anything wrong by posting the photos online.
Mr Palermo, who has visited the restaurant, said he was not happy with the photo on Facebook.
The CCTV images were no longer visible on the restaurant's Facebook page on Saturday.
Mr May said they waited for an hour and 45 minutes for their main courses on October 5.
He said they were waiting for food and what about 50 minutes after ordering, and they apologized and said it would be another 10 minutes.
But after another 30 minutes they asked again and were told it would just be another two minutes, he added.
Mr May claims the pizzas arrived at hour and 45 minutes after they sat down at the table, and he ate his but his partner had lost her appetite by then.
He claims to have a great deal of satisfaction with the bill leave.
So hey, hey, hey, hey, hey, hey, "investor in the restaurant" swore at him and told him to pay the full price.
Mr May said, "I refused to pay the bill as I was insulted, then they threatened me and I told them to call, I stood for a few minutes, and then I started to walk to the exit.
"I was then called names like 'a thieving scumbag' as i stood in the doorway, while this so-called investor stood outside the door.
"I did not want to break the law."
TripAdvisor and Facebook, where the restaurant wrote back and posted images of the couple.
It added: "People like you deserve to be shown up.
"Do normal people try and leave a restaurant without paying? You were chased outside by the customer.
"When you were threatened with being on Facebook you came back and paid for it."
After Mr May's partner pointed out that it could be a breach of privacy laws, the restaurant replied: "What GDPR? You come to our restaurant and cause trouble and walk out without paying and think this is normal?
"Of course we are going to make videos and pics of the event.
"By the way, we only have decent customers come in – we very quickly make sure we do not accept people like your friends."
Mr May and his partner claims that they have been damaged and there have been a breach of the General Data Protection Regulation (GDPR).
They have complied with the Information Commissioner's Office (ICO).
Mr Palermo said the restaurant had breached any laws by posting CCTV images of the customers.
He claimed, "The customer caused problems in the restaurant. They were very rude to the staff.
"They did not want to pay. It's not fair. It's not correct. It's not a moral thing. "
He added: "The customers had gone outside." They left with their coats on.
Mr Palermo denied that the one who intervened on "investor" and claimed that he was just a customer.
To ICO spokesman said: "Organizations that process personal data, including CCTV footage of identifiable individuals, need to comply with their obligations under data protection law.
"This includes letting people know that they are collecting the footage, keeping the images secure, and only disclosing the images when it is necessary to do so."
La Pizza has been accused of being "aggressive" when responding to customer complaints online.
On at least two occasions it has been posted on a Facebook page and posted them in comments under the reviews.
It told customer Daniel Bruckshaw after he complained: "Please do not pop in again or call either. We do not accept aggressive customers. Cancel our number. Thank you."
Mr Bruckshaw replied: "Aggressive ?! Eh? I think you've misunderstood my tone! Just providing some feedback … wow. "
In a letter to the customer, the Consumer Rights Act may give you the right to a discount or refund.
Customers are entitled to expect food "provided with reasonable care and skill", it said.