During my first run through the game, I would say "I'm gonna watch the cutscenes. Is that ok?" before we entered the missions. Some people would answer "sure np." and some people would keep silent but I never got a negative reply and never got harassed after not skipping a cutscene.
Of course this did not apply to "dangerous" cutscenes where you can be killed. I skipped them with everybody else and returned later with henchies to watch them.
Now, going through the storyline for the nth time, I always wait until the message says "(7/8) wants to skip". If it stays below this minimum, I assume someone wants to watch it and do not press skip so as to not pressure them. If I remain the only one not skipped, I press the button promptly. No troubles this way, either.
And this one does not apply to runs, obviously.
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