Good that she spoke up. I know the term used in both ways. But I’ve assumed it’s a verb and a noun. Flipping the pages of a book, or a chart that you flip can be called a flip chart?! Spanish has a few of these dual words as wellYears ago, a corporate training instructor shared that he had a woman in one of his classes that, privately, asked if he would stop referring to the "flip chart," as she was Filipino and "flip" is a derogatory term for her nationality.
Sometimes, you may not have a clue.