Have you sneezed with a mask on? I have... lotta stuff on the inside of that mask. Seems like it keeps some of the stuff that is not in the form of gas or vapor in! And if you tell your child something traumatic (like you’re a murderer!), that’s no good. Maybe a discussion regarding the nature of personal and social responsibility would be more effective?
I don’t like wearing a mask either. Few do. Not trying to force you change your pillow or mask. Just pointing out that both objects spend a lot of time near our faces. They are personal, long use items that we rarely clean or worry about cleanliness beyond the surface.