First off your experienced bodybuilder friend is an idiot! There is a HUGE difference between brown and white rice. Brown rice is a complex carb whereas white rice is a simple carbohydrate. Brown rice is ideal for meals that are not directly after a workout because it is a complex or slow absorbing carb. White rice is ideal post workout because of its fast absorbing properties meaning the carbs will transfer quickly to your muscles.
Pasta as a whole should not be taken as a insulin spiker. Pastas are considered complex/slow digesting carbs. If your looking for an insulin spike say post workout then try eating some simple carbs such as white bread and jelly or low fat poptarts. These will get the sugars quickly to your muscles while you are anabolic after your workout. If you have any other questions let me know man.
