Technically it is for the course of the hour we played. This is in an indoor club with paid memberships.
I think many younger people now have such issues because of the it is my "right" attitude. Irrespecitve of whether you payed for court time or not, it is still just a "privilege" to be on court, and not a "right".
told him YOU CANT BE DOING THAT
In the above example from OP the specific "quote" I stated can possibly make the receipient of the message defensive, irrespective what the etique is. If you have a "privileged"/blessed to be on court mentality, the proper response would be. "Sir, please don't run across the court, it could be dangerous". Or even better, don't really hit another 20 ball rally after the ball rolled across...... one or two shots to finish the point maybe reasonable.... but when you are rallying... you are not really going for much, which means the rally can be extended for uncertain period of time.
In general..... be considerative and send your messages in a proper way, and you will be treated back the same way.
The direct answer to your question is " Yes. The court etique is to wait for the play or rally to be done. And let the players on the court to push the ball back to you. Infact you don't even ever enter the others court, if everyone behaves"
But like I said, in the above case, it mostly has to do with a "court attitude" than "court etique".
The good court behavior from your side when a ball enters your court could be:
1. If you are in a co-operative rally, just stop the rally, right away, by catching the rally ball with your racket, and push the opponents ball back to the other court (assuming they are stopped and looking at you.. dont ever push the ball back to them when they are playing).
2. If you are in a practice match, just force an action to finish the damn point quickly (like if you break the string)... by for example moving in for an approach shot and volley.. or by going for a bit more aggressive shot.
3. If you are in competitive match, just call the Let right away, and avoid any confusion or distraction, if you are not in a situation to finish the point right away.