For some reason, you're reading things into the original statement that are not there. "An etiquette exists in a culture" does not mean everyone has to follow or even be aware of it.
I would say I'm accurately reading "Western culture" as a nonsensical concept.
Add an s and it gets a little better.
If mentally adding an "s" to the original comment enables you move past this issue and actually consider the comment as it was intended, then I would say that is well done and worth the effort to get to this point. :) Have a great Sunday!
Please don't do passive aggression here :(
Yeah, I see the problem. It's not a good way to convey what I was trying to say. Thanks for calling it out.