Meh, don't mind him. People have the need to feel superior to others, and he does that very well. He just doesn't understand how macros can be used
Macros work very well at all levels. Just at higher levels you may need a few more of them, and you will need to know when to use direct abilities instead of macros. I'm sure by then you will know that. Point of them is that it's much easier (and to many people, more pleasant) to use fewer keybinds than 20-30, leaving you to actually enjoy the game.