SwingsitlikeHogan
Major Champion
I was taught many years ago it was bad etiquette. When you are putting, there should be no other balls on the green.
Other etiquette/ rules I was taught were
The golfer whos ball is nearest the hole should tend/remove the flag for the first putt.
The person who had the first putt should then tend the flag for the second putt. (if required)
When the flag is lifted, it should be lowered to the ground/off the green and not just dropped
The first person to hole out should then retrieve the flag ready to replace it when everyone else has finished
Rarely do I see this happen
I was also taught all of the above - and that's why I prefer all balls lifted. Also when attending the flag: I hold the flag so it doesn't flap - unless flagstick is too long for me to do that; I ask which side of the hole the player would like me to stand; when I lay the flag down if windy I wrap the flag round the flagstick and make sure that it doesn't flap - and place it off the green if that is close by. I make sure that it is not behind the hole on the line of any players putt.