As someone else with a film degree, there are movies that are far longer and have far more dialogue. Stop trying to make that into an elitist thing. Or go watch Jeanne Dielman on repeat until you can’t get off to high brow cinema any more
As someone with a film degree, I can safely say film buffs are among the most gatekeeping of gatekeepers, right along metalheads (which I also am). "Subjective" is not a word in their dictionary.
Art is something so heavily based in opinion that you don't actually need any formal knowledge or training on the subject whatsoever to have an opinion on it.
This leads to every know-nothing shouting their opinions because all opinions are "equally valid" in this context of subjectivity. After all if you watch a lot of TV, you must know a lot about it right?
As the overeducated on the subject child of someone who founded a film history department at a major university, I'm less qualified, but I agree with you 100%.
And Avengers: Endgame was 3 hours long and had tons of dialogue, so if that's the criteria for 'too highbrow for the normies,' then the bar is set pretty low.