The same thing happens to my kids when I present them with a bash shell. They don't understand how to read the instructions, and they're uncomfortable with text commands. They don't want to type 'man' or 'help', and they give up very quickly. Everything they use on computers and game consoles are GUIs, most of them extremely easy to use by the standards of text interfaces like bash & vi.
This is a familiarity problem. You have years and years of experience with your OSes, which is what allows you to see outside the 2-inch window when you use a new application. You know exactly what you can ignore, and exactly what you need to pay attention to. They don't. Being unfamiliar with all of it and not having any idea how any of it works is what makes it seem like they're not learning quickly, but it's more because they're trying to learn everything at once, and are overwhelmed, not because they're not learning at all.