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.
I only ever hear that in movies. I assumed it happens if you eat low grade meat or smth like in the wild west in the US back in the day and it just became an old wives’ tale turned pop culture myth.
I do actually not like spicy food though, especially Chinese and Indian, but I’ve had enough of it to know I never had any gut issues.