This I can definitely understand, though I don't think I could do it myself. Planes are already so cramped and tight, and wearing something on my face just makes it feel even more compact. But the idea of wanting to wear a mask to keep yourself healthy, I definitely understand.
What I don't understand is the "I'm vaccinated but I'm going to wear my mask to protect others" kind of mentality. I mean that's a personal decision so I don't really care if somebody wants to go ahead and do that, but I just think it's strange and shows a lack of trust in the vaccine. The only reason I can imagine someone would is to virtue signal, like
@Newtwo said. A mentality of "I'm a better person than these other people because I wear a piece of cloth on my face that does nothing because I have the vaccine," is a perspective of such arrogant pride and such belittlement of one's fellow man who does not wear that piece of cloth. If the goal is to showcase one's virtue, I can think of no worse way of doing so than by indulging in the vice of pride.
And, just to be very clear to
@raven24 and
@MansionButler84, I don't think either of you are in the second category, nor do I necessarily think
@SoCalDisneyLover is, but I do think it's a category that exists and it's deadlier than any pandemic.