It sounds like you made every effort to be considerate of the other shooter. You told the other shooter that he might be bothered by the noise of your gun, and he ignored that information. Move on, and don't worry about him. You did nothing wrong.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman