How did we come to say something courteous to someone after they’ve sneezed

https://sh.itjust.works/post/4253316

How did we come to say something courteous to someone after they’ve sneezed - sh.itjust.works

How/why did saying things like bless you or gesundheit start? And when?

And why not farts
“I hope you didn’t just shit yourself on my couch. 😐”
This guy I worked with used to say, “What happened?”. He would always feign concern for the farter.
I say bless you normally for sneezes and sarcastically for everything else. Farts, hiccups, burps etc
Because the onus is on the farter to say something courteous. Because we, for some reason, decided that a involuntary, natural bodily function is rude.

involuntary

Speak for yourself

My girlfriend says “bless you” whenever I fart
She sounds like a keeper