It's not my place to police how or what people choose to use as their face covering, however, there could be a school of thought suggesting that at least some of those electing to use such as those could otherwise be in the group declaring themselves exempt. Indeed, the lady wearing the thing suggested her mother lives with COPD and finds more usual masks too restrictive on her already laboured breathing, but finds she can tolerate those acrylic masks for her already very limited period outdoors and shopping.
Life is full of compromises, and whilst I, and others, may choose differently, I feel it is important people have the right to choose, based on the same evidence as the rest of us, what steps they take.
For the avoidance of doubt, I do wear facemasks when in enclosed environments and respect others' space, but if I see behaviour that wouldn't be to my choosing, I avoid that person, or environment.