One of the things I like to bring up — particularly when people who don't want to wear masks start building their argument about limiting oxygen intake and becoming hypoxic when you wear a mask — is simply to ask the question of WHY surgeons wear masks for sometimes 8-10 hours straight in the operating room when (for example) doing neurosurgery or something similar.

To me, wearing masks is a courtesy and safety for other people not about protecting me. Here in the US (at least) people who protest masks are often too self-involved to consider that it's not just about them.