My response would have been, “In the trash”.
At that point, I hadn’t yet had one to throw away. Not long after, when I was hanging out at my favorite fishing hole (also a popular park with the homeless) a homeless guy I’d seen a few times came up to me and gave me a mask in a plastic bag. The local bum-enabling institution was handing them out. I asked him what I needed it for. He said “Use it to keep your nutsack warm, for all I care.” Hanging out around the lake gave me a different perspective on covid. The homeless weren’t social distancing, were sharing pipes, and associating with people that had just come into the area. Nobody ever got sick. One of them had a black mask at about the time it came into vogue to match your mask to your wardrobe. He said he liked it because it made him look like a ninja. I asked him where he got it. He said he picked it up in the parking lot at 7-11. All of this was after the city closed the park briefly. It soon became evident that the fushermen were not going to stand for being locked out while the homeless had free run of the place. The city posted all of the playground equipment, and taped it off. Looking back, it was nuts.
... in the trash ... where it is every bit as effective in protecting me from a respiratory virus as is the one you have on your face “protecting” you.