On Fri, Oct 9, 2020 at 02:03 PM, Mario wrote:

IMO, I don't see where it's rude.

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And, in this case, your opinion, or even my opinion, does not matter.  This is an issue of well-established netiquette.  And if you care to flout it, there will eventually be consequences.

And with this, I'm done on this topic.  A word to the wise is sufficient.
 
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Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041  

The purpose of education is not to validate ignorance but to overcome it.
       ~ Lawrence Krauss