For you, VR likely wouldn't be able to replace that social context. However for those kilometers apart, it might allow them to simulate it. See for example Big Screen[1] which lets you enjoy a group watching experience.
It might not be as good as sharing real popcorn, but it can be a surprisingly convincing imitation.
We have tried this with a friend recently with that app, and I can tell you it was miles better (in terms of feeling natural) compared to, say having a video call or Discord.
We played a few flat (not VR) games, on a super large screen in a cozy virtual room, with directional audio that is always on. With your attention being taken on what is happening within the game, it's -almost- as convincing as sitting together and playing the same game.
I can already say that this is my favourite way of playing couch co-op remotely. Haven't tried movies, yet I wouldn't expect the experience to be any different.
It might not be as good as sharing real popcorn, but it can be a surprisingly convincing imitation.
[1] https://store.steampowered.com/app/457550/Bigscreen_Beta/