I personally still mask up in certain scenarios. If I am going on vacation, for instance, I will mask to reduce my chances of being sick on vacation. If I see that the local COVID numbers are particularly high, I will wear one to the grocery store. There are a lot of scenarios where putting it on causes me zero inconvenience and potentially reduces the risk of me feeling miserable or missing an important life event. Having everyone at the grocery store see my face is not important to me.
if they're sheer or made out of latex, i don't think that's why they're wearing them :)