I always volunteer to wear a mask when in other people's homes. Recently was in a rather dubious HMO with about 22 people inside - families crammed together. No one but me wearing a mask. Madness. I notice that some people are very strict about adherence whilst others, some with three generations of family in situ, as well as the neighbours, their friends and kids' friends too, don't give a hoot. No masks. Some people actually insist I don't wear a mask!