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You seem to be contradicting yourself. Probably unintentionally. Your science is correct and the mask will not affect the proportion of oxygen to CO2 and yes it does make your heart and lungs work harder to drive air through the filter.It definitely, totally and completely does NOT reduce the amount of oxygen. It's a social media BS story, like flat earth, sasquatch etc.
The amount of oxygen in the air is pretty constant and the weave on the mask does not prevent the oxygen allotrope, dioxygen (O2) from being breathed in. Its size is measured in nanometers and the weave of any mask will not restrict O2 from getting through.
Wearing a mask that is of a quality enough to reduce your chances of getting infected, requires the muscles that make your lungs expand and contract, to work slightly harder. The brain thinks OMG, there isn't enough air and so starts to worry. The need to work harder comes from water vapour being caught by the mask. The virus lives in water vapour or droplets, which is how the mask works (depending on the quality of the mask). Oxygen, Nitrogen, Argon & Carbon Dioxide molecules and allotropes are so small that they pass through a mask without issue.
The reason why some are exempt is that some people with more limited lung function, or restricted airways, might be advised to not make their lungs work harder, but for most people it's actually good to make your lungs work a little bit harder. That's why people go running or walking. You can buy things that force the issue as a type of fitness trainer. Swimmers use them a lot.
For people with asthma or other disorders, this is the last thing they need.
Imagine if you found flying stressful, have asthma and then are also forced to wear a mask. Not good. Can bring on an attack. My wife has real panic attacks in these situations and she is no snowflake.
Masks compulsory? Avoid ferry or planes