Is for masochists.
He's talking about how on a biological level, capsaicin (spicy ahhhhh chemical) triggers the thermal receptors in our tongues, meaning that it makes your brain think your tongue is on fire. Therefore, by liking spicy food and willingly setting your tongue ablaze and feeling heat pain, you are a masochist.
why do people drink alcohol?
or to put it to a tee for comparison, why do Italians love wine so much? while Italians love wine for the exquisite and rich taste, addiction is a huge part, much like spicy food is to many other cultures (also including your culture, especially near Calabria, where, cmiiw, you guys use a lot of peppers there, and even pepper jams).
I guess spice is an acquired taste. I hated wasabi until recently, after I started eating more JP cuisine; I still hate the jalapeño-type spice and I'm trying to get used to it so I can handle more of the stuff my Mexican friends give me, especially since I'm literally in Southern California, right above Baja Cali 😭