Is it RUDE to not say BLESS YOU when someone sneezes?

Anonymous
Is it RUDE to not say BLESS YOU when someone sneezes?
I stopped saying "bless you" when people sneeze because I'm an Atheist and I've had too many people be a dick about it, when I say "bless you" they turn to me and say stupid bullshit like "AH HA!! I caught you!! you do believe in God and only seeking attention and trying to be "edgy""

But I tend to feel a bit of guilt for not saying it, not the depressing type of guilt, it the type of guilt you feel when you don't say please and thank you.
It IS rude
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It is NOT rude
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Is it RUDE to not say BLESS YOU when someone sneezes?
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