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Bless you is OK. The worst part, to me, is the expectation to meaningfully reply? If I bless your sneeze, please don't feel obliged to say anything.
If I’m correct, I think it came about when people were dying of the plague, and sneezing was a sure sign of death for said sneezer, so people would say bless you in response. Not sure if this is correct though but it’s information my brain has stored for some reason haha. >

Even worse is that mandatory "thank you" while I'm trying to wipe the snot off my lip. >

Hopefully with a napkin >

It came from when people thought sneezing was a sign of being possessed by demons. Even after we all know better, it continued. >

Oh, take out the broomstick. >

I don't mind it. We're social beings. What bugs me more is that we say something when sneezing and nothing when coughing. Can lead to funny situations when the sound is not so clearly identifiable. But hey... we have more dramatic rhings to deal with even daily xD