A pregnant woman and her family criticized the Pizza Express after they said they could not enter because they were travelers.
Mum Chick Wilson filmed the incident that happened yesterday at the network affiliate in Doncaster's Leisure Center and sent the recording to Facebook.
Chick had gone out with the family to the popular chain of pizza restaurants.
In the filming, a staff member tells the group, "I can not allow any commuter community to come in."
When asked why, he adds, "Because we've had a lot of trouble in the past."
Filming caused outrage on the social media site, with some saying that politics was simply discrimination.
Chick wrote on his Facebook page: "Wow was refused pizza service expressing Doncaster because we are travelers !! Please share this is !!
"Edit to post, I'm pregnant too."
She added that her 5-year-old son, David, asked her "what's wrong with being a traveler" after the incident and said "that's not fair".
Tracy Cockayne said: "I'm sorry for reading this status that really went crazy and saddened me to know that this kind of intolerance is still going on in 2019. I really hope everyone boycott Pizza Express."
Chick said she was contacted by a team specializing in discrimination cases and that she was taking action against the company.
A PizzaExpress spokeswoman told The Sun Online: "PizzaExpress operates a zero-tolerance policy on discrimination of any kind and the safety of our customers and team members is paramount.
"We ask the customer to contact us so we can provide more context.
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"While not an excuse for this customer's experience, further investigation revealed that the manager was acting in agreement with the police council after past disturbances.
"Our teams can face difficult decisions and we trust that they will use their judgment to the best of their ability, although this is not always easy.
"We would like to apologize unreservedly for any unintentional offense caused to the client or his family, and we look forward to welcoming you back soon."
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