it's a form of signalling herd membership. compare people bragging that they are bad at maths - people are bad at all sorts of subjects, but mathematics is unus

it's a form of signalling herd membership. compare people bragging that they are bad at maths - people are bad at all sorts of subjects, but mathematics is unusual in that people are proud of their ignorance of it, because they are essentially signalling that they are part of the "non-geek" tribe. similarly, people are uninterested in all sorts of media, but are proud of a lack of interest in tv because that signals their membership in the "non-mainstream" tribe.