OP clearly doesn't understand how difficult it can be to breathe through a regular mask if you're for example working 8 hours a day and can't even take it off during your stay at your workplace, especially in a warm/hot environment and physically intensive jobs. It literally gets harder to breathe in a mask the longer you have it on. Of course, I don't know about those masks with an air filter, but most people wear regular ones, and I've also never tried it.

Not only that, but they don't understand that some people genuinely have actual breathing difficulties due to other disease, and even if they do not, then if you've got to go outside for a long time, you may also get to experience breathing difficulty.

OP should really try to think more often rather than stick to his own belief of "Oh, you don't wear a mask/have it under your nose because you're literally suffocating? Hah, what a load of bullshit!"