Fashion designer Michael Kors (CPRI) cited TikTok trends and Taylor Swift’s embrace of independent brands as proof that the luxury handbag market is competitive in a Manhattan courtroom on Monday.

In a federal courtroom on Monday, storied fashion designer Michael Kors spoke about the steep challenge of staying relevant in a world where brands can rise and fall based on viral TikTok videos and photos of handbags on the arms of celebrities such as Taylor Swift and Beyoncé.

Fashion designer Michael Kors told a federal judge that competition in the handbag market is so robust and varied that he first learned about one brand only when he saw a photo of a bag on Taylor Swift’s arm.