In the souvenir shop Pete and Chris weren't wearing masks either, but there was no in-story reason for that as far as I recall so I was willing to hand-wave it as being for performance reasons they had no masks but in "reality" they would have been masked. So in Strolling to the Polls for most of it the main characters were out on the street, and Mulaney was never masked at any point when he told them the polls were closed, so I looked at it in the same way. When they finally got in line Lauren was masked -- and then unmasked Mulaney appeared and told them they couldn't enter without masks, meaning that they should have been masked (but really so should he have been in that scenario).
I guess since the voters were presented as just people who happened to have come out without their masks, it wasn't intended to suggest that these people we thought were victims of (likely Republican) voter-suppression tactics were actually virulent (likely Republican) anti-maskers, so my vague both-sides feeling may have been unjustified. But pivoting from the voter-suppression angle took away some of the impact of the satire for me.