My favorite course in my psych degree I finally completed in 2022 was Media Psychology. I was fortunate enough to study with the authors of the textbook. Your point is not a frivolous one, and studying what is popular has its own interesting lens, even if many don't yet have the frame for the lenses. The textbook is so well written, I've recommended it to many the layperson, as it's easier to read than most, but having some foundation in psychology does help. https://www.routledge.com/Understanding-Media-Psychology/Stever-Giles-Cohen-Myers/p/book/9780367518974