Oh. I believe it.I've heard stories similar to that and I don't believe them. I have been eating hot peppers my entire life. I've eaten them all over this country when I drove big trucks. I also lived in New Mexico for about one year. I have never eaten a habanero, or a sauce made with them, that was hot to me. They don't even come close to the heat of a Carolina Reaper pepper.
Habaneros aren't anywhere close to Ghost peppers or Carolina Reapers, but they're hot enough to folks who aren't used to eating the hotter peppers.
Anecdotal data, but back in college, I went to an Asian potluck dinner party where everyone brought a dish, and there were a fair number of foreign exchange students from Asia.
I had a recipe for a Chinese chicken dish that had a chili/pepper sauce (made/served separately, so an individual could dial it in to their personal preference).
The local Asian supermarket was out of the Chinese peppers the recipe called for, so I substituted habaneros instead.
The Asian exchange students said, "Hey, you made this? Wow, it looks authentic and smells amazing!", but when they tried it with the sauce (I guess they were used to slathering it all over the chicken), their immediate reaction was, "What kind of peppers did you use?!!!".
I told them that the Asian market was OOS of the peppers I'd been directed to use, so I used habaneros instead. They told me that the sauce was WAY hotter than it was supposed to be/they were expecting, and these are folks who are used to peppers in their cooking (and consider Jalapenos to be mild).
For the majority of the pepper eating world, Ghost peppers and Carolina Reapers tend to be on the extreme end, specifically for folks who like REALLY hot peppers.
I've traveled to India, Thailand, Hong Kong and several other countries that regularly use 'hot' peppers in their cuisine, and while some of the dishes were hot, I haven't encountered anything there that I found too hot to be able to eat.
Based on my travels (and what's considered normal in those countries that regularly use peppers in their food), I'd say that it's more common to find folks who like the CR/GP end of 'hot' in the Southern US, than in Asia.
As for that story about sauteing hot peppers; I was at one of those open uhhh... wall(?) restaurants, common in Asia (i.e. there's a roof, but when they're open for business, they roll up the metal walls) that specialized in Szechuan cuisine (generally known in most of the world for being hot/spicy).
The kitchen area was not only visible to the public, but there was no wall/glass etc. separating the dining table area from the kitchen. Just counters to separate the diners from the kitchen area (so you can see and smell everything cooking).
When the chef tossed in about 5lbs of chili peppers into the really hot, gigantic (as in ~4'-5' diameter) wok, about 5 seconds after the crazy sizzling began (we were seated ~10 yards away from the chef and that huge wok), I had to stagger outside for air, as I began choking from the fumes, and my eyes were burning.
I wasn't the only one. A fair number of locals joined me. I'm thinking the folks who just sat there, continuing their conversations completely unfazed, might not be hampered a great deal from getting blasted with pepper spray.