A simple accidental tap of the call button in an airplane bathroom led to a 10-minute weight-focused lecture for Tess Holliday — and the body positivity advocate is speaking out about how she reacted in the moment, plus what she’s pushing for next.

Model and activist Tess Holliday is calling out United Airlines after claiming a flight attendant delivered an unprovoked and wildly inappropriate lecture during her first-class flight. The trailblazer behind the body positivity movement and author of Take Up Space Y’all opened up exclusively to People, walking through the ordeal that left her stunned into silence.

The incident unfolded on a United flight departing Tampa, Holliday explained. While in the restroom, she accidentally hit the flight attendant call button with her hip. But when she stepped out, instead of asking if she needed assistance, the attendant launched into a shocking diatribe about her body and health.

“He told me he noticed I was traveling with my kid, and then said losing weight would be ‘in my best interest,’” Holliday recounted to the outlet.

It didn’t stop there.

The attendant doubled down on the inappropriate comments by bringing up his own sister, whom he described as “very, very large — probably around your size.” He then told Holliday his sister “also needed to lose weight” and warned that “carrying extra weight has long-term negative effects on our health,” according to her account.

Holliday was traveling with her 9-year-old son, Bowie — a detail that kept her from pushing back in the moment. “This went on for about 10 minutes, and I was just stunned,” she admitted. “I didn’t want to create a scene in front of my son, but I was also in total shock that this was happening.”

United Airlines eventually issued an apology for the situation, but Holliday isn’t looking to get the flight attendant fired. Instead, the vocal advocate — who frequently collaborates with the National Association to Advance Fat Acceptance (NAFA) — is demanding bigger change from the airline.

“I told them I don’t want him fired — what I want is sensitivity training,” she told People. She even connected the company with NAFA, hoping the disturbing incident can spark education and put an end to fat-shaming on flights.

The irony isn’t lost on Holliday: She was flying home from a speaking engagement where she addressed 500 middle and high school students about her recent book.

“One of the topics we talked about was how to handle people who bully you about your size,” she shared with the outlet.

According to People, a United Airlines spokesperson declined to comment further on the matter.

Holliday later took to her official TikTok to share her experience with her followers.