I prefer if people would skip cutscenes, but I don't say anything if they don't either. I just quietly mind my own damn business because there are two very different sides to dungeons: speed runs vs. story mode, and neither side is the "only" way to be, nor is one side "more correct" than the other. If you're using DF, you could easily run into both groups of people in the same party, and quite frankly any player worth being in a group with is going to understand.

There is one exception, however: If we're running short on time, I do expect you to get your rear out of the cutscene. I've had this issue before, and there is absolutely no excuse for twiddling your thumbs in a bloody cutscene if time is running out. Suck it up and watch it later for the sake of actually completing the run. This is for your own benefit as well as everyone else's.