>>14358115You get a portable oxygen concetrator like an Inogen One.
You carry it around in a nice leather bag.
Passive Agressive faggots demand mask
Pull it out and say, sorry, can't. Works everytime.
If you aren't a doctor or don't have one who can write the Rx, there are online services that can prescribe them. You can also get a used one on marketplace.
There are also chicom versions on AliExpress but they're bulkier and don't look as good and I don't know about the quality.
https://www.aliexpress.com/item/1005003677799059.html