Spicy food never affects my gut and everyone thinks it's really weird. How unusual is this and what could be happening to explain why spicy food doesn't affect me?

I absolutely love spicy food, and it's never affected my gut. I was actually confused when I read about people getting the shits after a curry and wondered if it was a joke. I've had curries so hot it caused people to recoil into a coughing and sweating fit after they dipped their finger in and had a taste and I have one every other day. I feel the burning in my mouth, my face turns red, my forehead sweats, my esophagus feels weird, but (tmi I know lol) when I go to the toilet I'm completely fine. no gut pains either.