Overstimulation Bathroom Break

Got a little overstimmed at the library and got up to go to the bathroom for like 15-20 minutes until I calmed down. When I came back and walked to my seat, two girls were talking about me and laughing and saying “wow, she was in the bathroom FOREVER” and that I must have had something wrong with me. I am so embarrassed, but also, why would they care that much to even say something???