A Minnesota family was asked to leave a Southwest airlines flight from Denver to Minneapolis Sunday over a negative tweet about one of its employees.

Duff Watson was traveling with his two children. He is an “A-List” passenger, which means he gets priority boarding. But an agent told him his 9-year-old and 6-year-old children could not board with him. Frustrated, he told the agent at the gate he was going to tweet his dissatisfaction with her service. What did he tweet?

“Something to the effect of, ‘Wow, rudest agent in Denver. Kimberly S, gate C39, not happy @SouthwestAir,Watson told CBS.

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Then the family boarded. After they were seated on the plane, they were asked to get off, reports CBS Minnesota, because the agent said she felt the tweet threatened her safety. Watson said his children began to cry and the family was not allowed back on the flight until he deleted the tweet.

Southwest Airlines sent the following statement to CBS about the matter:

On Sunday a customer was removed for a short time from flight #2347 from Denver to Minneapolis... The incident is currently under review

Southwest Airlines apologized to Watson in an email and sent him three $50 vouchers. But Watson is not satisfied with the airline’s response and said he will not fly Southwest again.