I don't see it as an insult, rather that he's trying to work on another aspect of his game. I hate having to grab the bridge myself. Unfortunately, I'm neither ambidextrous nor tall.
I don't see the issue. He wants to improve shooting left handed and you obviously want to improve your game. I don't understand why you can't do both at the same time.
On a bright side I do know a certain member on here that will run racks of 9 ball left handed or right handed.