To be fair it took me couple of days to learn the basics of react. But I had years of programming experience, including other frontend frameworks like angular, angularjs, knockoutjs etc.
A textbook example of the original meaning of Dunning-Kruger, wherein an inexperienced person is unaware of what they have yet to learn and thus overestimate their existing skills.
This is a good point imo. They just don't know the breadth of it yet. Being experienced also means getting a grasp of the amount of stuff you don't yet know.
To be fair, I know enough first aid and background information to understand some basic medical books, and I can 1000% guarantee that you never want me to treat you for any medical problems.