Example 1: A boy is reading/watching LoTR. Mom comes in the room and says something like, ‘Time for bed your PIXIES can wait until tomorrow. Has this woman been living under a rock? Does she pay no attention to her kids interests or what he watches/reads? I hated Power Rangers in more ways than I can describe, but I knew what it was, who that bad guys were. I know more about the original version of that show than anyone should for their mental health.
Example 2: Mom is talking about how kids’ tastes change from year to year she says something like, 'Kids one year it’s dinosaurs the next it’s camels." Her apparent daughter is standing next to her wearing a t-shirt that clearly depicts a LAMA. The daughter replies to her mother, “Lamas”. Blah, blah, commercial selling whatever. Mom says at the end, “Are you sure it’s not camals?” YES lady she’s sure because camels have HUMPS lamas do not. Thus the picture on your kid’s shirt is obviously NOT a camal because it doesn’t have a hump, and really it’s a lama.
Parents not understanding their kids’ interests, and coming across as clueless (often by using the wrong words/names) is a time-honored trope in entertainment (and, for that matter, commercials).
I could look up examples on The Youtubes, if you like.
Ads are well controlled over here to eliminate the kind of disparaging bias that you describe.
We don’t get the washing powder ads that imply that a mother is a failure because she doesn’t use brand x anymore. Vacuum cleaners and washing machines are not exclusively operated by women.
The llama is a quadruped which lives in big rivers like the Amazon. It has two ears, a heart, a forehead, and a beak for eating honey. But it is provided with fins for swimming.
All I can say is that my parents (born in the late 1920s) had only vague ideas about my early-1980s interest in Star Trek, Star Wars, Goldorak (aka Grendizer), Albator (aka Harlock), and dozens of other things. I didn’t know Dune or Tolkien lore back then, but if I had been reading the books they wouldn’t have known anything beyond the pictures on the covers. The important things were my school grades and some notions of morality / proper behaviour as seen by ordinary religious people born in the late 1920s. We never did a commercial together, but in everyday conversations they would have seemed just as clueless as the ones in the OP.