There's also something about many TV-watchers which compels them to comment as you have (though similarly: those who don't are far less visible).
In a complex social context, behaviours and adornments are social signifiers. They indicate tribal affiliations, and status. What you wear, eat, drive, listen to, do recreationally, watch, and other elements, aren't simply goods and activities, they're social signals, and they act as such because the underlying realities are far too complex to express succinctly.
And what others do, or criticise, isn't simply about behaviour, but about tribe and status.
Which is almost certainly why the urge to state one's own preferences, and to comment on the expression of preferences by others, is so ingrained. And so emotionally-laden.
Incidentally, I think this is one of the reasons why markers such as hairstyles, beards (generally for men), tattoos and bodymarkings, and the like, are such culturally-persistent indicators of status or relationship. It's possible to change your clothes in a few moments. A hairstyle is a committment -- of at least a few days or weeks, but potentially of years. Tattoos are as enduring as diamonds, effectively, and cannot be worn or doffed. Complex braiding, dreadlocks, and the like, require hours, or months, of cultivation.
(Or the ability to spend conspicuously on hairdresser services.)
Even within a given religion, different monastic orders will often have subtly (or profoundly) different hairstyles. Some rounded, some squared, some shaved, some long.
(Also notable: shortening hair, rather than lengthening it, is a rapidly-attained style, requiring only a few minutes with shears and a razer. Tan patterns may take a few days to normalise, but also adapt quickly. Which may be why shaved heads and faces are frequently seen as less credible, or are applied to, e.g., prisoners and fresh recruits, as a rapidly-achieved unifying (within the cohort) and distinguishing (from society) mark.)
There's relatively little serious work on the topic of fads and fashions, which extends to other areas, also typified by complex underlying structures: academia, music, literature, technology, law, and business management. Thorstein Veblen is among those who's written on the topic.