"The worst airline in America", she tweeted Saturday night.
Coulter initiated the exchange by complaining how she was unceremoniously removed from an extra leg room seat (she is six feet tall) for another passenger. In a subsequent tweet, Coulter explained that it was Delta gate staff that gave her pre-booked seat away to another customer.
While Delta did give Coulter a $30 refund for her reported troubles, the airline also threw some shade at the pundit for her mean-spirited tweets directed at the company's other passengers and employees.
"We are disappointed that the customer has chosen to publicly attack our employees and other customers by posting derogatory and slanderous comments and photos in social media", the airline tweeted.
When you buy a plane ticket, you agree to the extensive terms spelled out in the airline's "contract of carriage".
- Ann Coulter (@AnnCoulter) July 16, 2017.@Delta motto: "How can we make your flight more uncomfortable?"
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"Delta expects mutual civility throughout the entire travel experience", the statement said.
"Additionally, your insults about our other customers and employees are unacceptable and unnecessary", Delta added in a follow-up tweet.
Predictably, Coulter's fans lined up behind her and her critics defended and even praised Delta.
Coulter has managed to use her alleged inconvenience by Delta to shoehorn her complaints about everything from the Affordable Care Act to immigration. The seat was given to another female passenger, according to Coulter.
Coulter later tweeted that she was informed she was moved due to an "emergency", but that didn't stop the conservative commentator from continuing her anti-Delta rant.
She ridiculed the $30 refund, saying on Twitter that it cost her $10,000 of her time to select the seat she wanted, investigate the type of plane and periodically review seat options.
A considerable number of people on Twitter were entirely unsympathetic to Coulter, thinking that she was making much to do about very little.