It’s the Lake Wobegon effect, named after Garrison Kiellor’s monologs, famously introduced as “Lake Wobegon, where all the women are strong, all the men are good looking, and all the children are above average”
More technically it can also be classified as a manifestation of the Dunning-Kreuger effect (stupid people are the worst at gauging their own ineptness, and half of us are stupider than the median).
