I have long since forgotten where it was that I just wanted to insert "Are you sure this is not just X?" into some comment thread. Maybe reverse Dunning-Kruger is a good enough label.

Ironically, the most competent people in a given area are more likely to under-estimate their ability compared to others, whereas those most lacking tend to vastly overestimate, in a psychological phenomenon known as the Dunning-Kruger effect.