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I like saying "stop it"
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 >

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. >

Me grabbing a tissue to clean the film of mucus off my face: Thamnkf Yoo >

I grew up in America (in the south) and it was common to hear older people say “scat!” When someone sneezed. Something about shewing away a cat? I’m not really sure the whole meaning. But anyway I like to say that instead and confuse people lol >

I've always enjoyed "Take that!" >

But you have to do it, or Beelzebub may take over their body while they are momentarily disabled by sneezing .... Obviously >

I had always been told that the "Bless you" was because your heart skips a beat while sneezing. I never actually thought about it.
Edit: after a search, our hearts do not "skip" a beat but some in fact are thrown out of rhythm,  so maybe there is a partial nugget of truth. >

The origin of blessing the sneezer is far older than so far recognized in this thread. 
Hindus wear the red dot tilac in the centre of their forehead, as recognition of where the soul/third eye resides in the body. 
A rather superstitious belief arose that when a person sneezed, they sneezed out a portion of their soul. 
The custom of blessing the person began with this, but is kept alive millenia later by many other cultures, passed down as a superstition from Hindu culture, where ironically, today it is largely forgotten. >

We've been doing it for at least hundreds of years. It's just a habit at this point. I promise that I don't mean it when I say it: it's strictly a reflex at this point in my life. >

I never say it. To me, it makes no sense.