I love spicy food. I have almost never approached a dish and said “Nope, that’s too spicy.”
That stated, I tend to avoid “Suicide-level” spicy these days (On a scale of 1 - 10, the scale might be: Nothing, Very Sweet, Sweet, Mild, Medium, Medium Hot, Hot, Spicy, Very Spicy, Suicidal). I usually like something in the 7 to 8 level on that scale… a good dose of Sriracha on everything when I remember (burgers, pasta, rice, soups), chili that has a hefty kick (3 or 4 jalapenos, 1 or 2 more powerful peppers), or a good dose of red chili flakes in pasta sauces and pizza. Oh, and tabasco or hot sauce for dipping pizza crusts in.
My partner used to be with me, but is now firmly in the 4-5 level (medium to slightly-less-than-medium). As a result I tend to under-spice when I cook and then compensate with hot sauces afterwards.
Now, all that stated, “Hot for the sake of hot” is another way of saying “Bad for the sake of pain.” A good hot sauce should have a pleasing warmth that fills the mouth and clears the sinuses, but it has to taste good, and it’s surprising how often hot sauces are like “forget flavour! All pain!” which defeats the point of enjoying food. I’ve had a few Suicide-level spicy dishes, and when they’re good I love them (this one place near McMaster University had these spectacular Suicide Chicken Wings that, if you could eat 20 of them they were free… they politely asked me to stop ordering them because damn they were good), but generally they’re just pain. And that’s no bueno.
And these days I’m not as cautious about touching my face when I eat spicy food. So that means I have to be a bit more careful too.
Oh, and there’s something about raw-spicy food that I struggle with sometimes. Like, I will put 2 thai chilis in my pho without hesitation, but if I nibble one while raw I almost always regret it.
I love wasabi (North American wasabi is actually horseradish with flavouring, but I love it… Japanese wasabi is a lot more subtle, but I love it too), I love gochujong, I love lamb vindaloo… my favourite Doritos are the “roulette” ones where 1 out of 20 chips is “really” spicy, and I wish I could just get bags of the “really” spicy chips without the plain ones.
I don’t know if the Hot Ones would give me issue. I suspect that I’d Alton Brown the things and be like “Yeah, that’s spicy, but it’s all vinegar, and that doesn’t taste good…”
Oh, there is a spicy fish that’s a very traditional Chinese dish that I don’t mind but I’m not crazy about. Uses these red peppercorns that cause numbing instead of heat. The fish is great, but the broth isn’t designed to be eaten because of the numbing. It’s fine, but give me a good spicy thai chicken laksa soup any day of the week.
As for which cuisine has the best spicy spices… Caribbean I find the most consistently powerful with good flavour, and they’re often variations on Indian spices.