Banned from Pizza Hut for wearing a thong

As the title suggests, I was recently fired from my job at pizza hut because I bent over to eat a pepperoni that fell on the floor, exposing the thong I was wearing. I have the feeling that this is because I am a man, and I think I would have been treated differently if it was a woman. A customer did see the thong, and he made a point to compliment my physique. I dont know why I would get fired for this, my manager insists it wasnt because of the thong but because I kept eating food off the floor. I just know he is lying though. How do I get HIM fired?