I don't disagree that it was a very quippy movie, but I'm not sure it's a bad thing? I feel like tables which have a consistent, dramatic tone throughout a campaign are much more the exception than the rule (and often populated by professional creatives). In my experience, most campaigns wind up being occasional islands of drama surrounded by a nonstop stream of attempts (of varying quality) to make each other laugh. Sometimes, you can even hold the drama. Idk, like I said, I understand why it would annoy you, given the wider movie landscape, but I also feel like it was authentic to an "average" game of a 5e DnD, and therefore it didn't bother me.

Don't get me wrong, I love the more earnest takes on epic fantasy that have been set in the Forgotten Realms / DnD, but I also get that coming out treating DnD as Very Serious Business (TM) was going to be a pretty tough sell.