And it has all kinds of implications and context and shit.
How the fuck am I supposed to tell what's just people doing things at random and what's a part of all-singing-all-dancing-shit-show the neurotypicals call "social norms"? Down with NTs.
Honestly while it's really fucking annoying that refusal to participate could result in some silly neuronormo interpreting a completely innocuous action as an offense, and it can cut you off from social shit, I think it's basically the only way. The same button never does the same thing twice. Screeching rn.
In Poland we say "Na zdrowie" which literally means "For good health". Even if it's only an allergy, I think it's nice to wish people good health after a sneeze.