My problem with someone saying "bless you" is the lack of guidance about what to say in response - Debrett's has nothing on the matter.
Saying "thank you" seems to work, but if you're still sneezing, you can't say it in time, and then you're paralysed by embarrassment, and all you can say to alleviate the discomfort is to tell them to fuck off and leave you alone.
My problem with someone saying "bless you" is the lack of guidance about what to say in response - Debrett's has nothing on the matter.
Saying "thank you" seems to work, but if you're still sneezing, you can't say it in time, and then you're paralysed by embarrassment, and all you can say to alleviate the discomfort is to tell them to fuck off and leave you alone.
It's a minefield of manners.