I think Romans 14 helps us on the matter of wearing masks, though I am not saying that those who believe we should wear masks are weak in faith.

Remember in Romans 14 the strong believed they could eat foods that were unclean according to the OT (Lev. 11 & Deut. 14), and they also believed that the sabbath and special feast days were no longer mandatory.

The weak thought one should refrain from eating food deemed unclean in the OT and also believed the sabbath and other feasts should be observed.

Paul clearly agrees with the strong theologically. No food is unclean now that the new covenant has arrived and Christ has come (Rom. 14:14, 20). The feast and sabbath days are no longer required (Rom. 14:5–6).

Still, when with the weak, they should refrain from eating unclean foods out of love for their brothers and sisters who think differently.