I suspect that discarded masks create a problem for urban infrastructure as well. Disposable masks are essentially strings attached to a small net. I suspect that these things are clogging up sewers and drainage systems.
Masks and other waste should be treated like a bio-hazard ... which means that disposing of the stupid things is more difficult than regular trash. I suspect that few people actually care about that.
PS: I have one reusable cloth mask. Of course there is plastic involved in those test kits. I was jabbed with a single use container that had a pointy metal thing on one end.