потому что собеседник во-первых в очередной раз выбирает то, что ему подходит, что противоречит научному подходу, а во-вторых приводит исследования типа "маски не работают и руки мыть тоже не надо", и это тоже вызывает вопросы

впрочем, не нравится, не мойте руки, это другим мало мешает

https://pubmed.ncbi.nlm.nih.gov/24229526/

Results: The median-fit factor of the homemade masks was one-half that of the surgical masks. Both masks significantly reduced the number of microorganisms expelled by volunteers, although the surgical mask was 3 times more effective in blocking transmission than the homemade mask.

https://pubmed.ncbi.nlm.nih.gov/18612429/

Principal findings: All types of masks reduced aerosol exposure, relatively stable over time, unaffected by duration of wear or type of activity, but with a high degree of individual variation. Personal respirators were more efficient than surgical masks, which were more efficient than home-made masks. Regardless of mask type, children were less well protected. Outward protection (mask wearing by a mechanical head) was less effective than inward protection (mask wearing by healthy volunteers).

https://pubmed.ncbi.nlm.nih.gov/19193267/

During the 2006 and 2007 winter seasons, 286 exposed adults from 143 households who had been exposed to a child with clinical respiratory illness were recruited. We found that adherence to mask use significantly reduced the risk for ILI-associated infection, but <50% of participants wore masks most of the time. We concluded that household use of face masks is associated with low adherence and is ineffective for controlling seasonal respiratory disease. However, during a severe pandemic when use of face masks might be greater, pandemic transmission in households could be reduced.

https://pubmed.ncbi.nlm.nih.gov/19652172/

Conclusion: Hand hygiene and facemasks seemed to prevent household transmission of influenza virus when implemented within 36 hours of index patient symptom onset. These findings suggest that nonpharmaceutical interventions are important for mitigation of pandemic and interpandemic influenza.