Every time there's a lax of previous manners/courtesy, no matter how ridiculous such a little thing may be, it's just opens the door for more of the same on down the line.
Yes you're telling him to 'move with the times' but at the same time the next generation is telling you the same thing about opening doors, please and thank you, swearing, etc. It never ends, and never will so long as rebellion is considered normal and acceptable in our society.
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