I used to know a guy online who swore he had zero allergies. He started every day with boatloads of coffee and ended everyday with boatloads of wine.
Uppers in the morning -- like caffeine -- and downers at night so they can sleep -- like alcohol -- is a standard treatment for allergies. I suspect he had undiagnosed allergies and maybe could have acted like less of an alcoholic if the allergies were identified and properly treated, starting with the standard practice of trying to avoid triggers as much as possible.
The older I get, the more skeptical I am that other people are as different from me as they claim and as the world claims. I don't think it's actually good for anyone to be around rotting trash, etc.
But, certainly, when someone is especially vulnerable, we should make an effort to be more careful about such things. As I get healthier, I'm more able to tolerate "normal" things.
Meanwhile, the entire world is very suddenly embracing practices I have long pursued while everyone pointed and laughed and called me crazy. It seems the world's cavalier attitude about how such things don't matter if you aren't defective like me is catching up to it and there's hell to pay.
Many years ago, I had a reaction to penicillin, but only recently someone said to me (not a doctor) hey, if you're allergic to penicillin, you're most likely allergic to mold.
So, a lot of what you say reminds me of my own experiences, but it may be a point of view of someone who has a sensitivity that isn't actually universal.
I definitely empathize with the sense that moisture and carpeting and stuff are toxic, and that all trash must be sealed off from living areas. But I also have lived with people who didn't follow the same rules, and they didn't have the same problems, which points to the issue not being living style alone.