Someone may be nagging you to complete a project in their way, rather than your own way. While this may be irritating, by engaging with this individual and arguing, you will only wind up feeling even more irritated. If you have the authority to continue on as you have been going, then do so. There is no need to argue about it. If you don't, you have to make a choice - to do things their way, or to find your way out of the project. Try to see this in the most logical way, and you will know what to do. It can work out well for you, though, if you just do what you know to be appropriate.