I think there is a time and place to singalong and have fun, but they need to be planned events. Some people want to enjoy the movie as it was intended. There is room for both. Be respectful of the people around you who may not share your enthusiasm.
I saw the Wicked movie this past weekend. I absolutely loved it. Yes, I know every word to every song in the Broadway soundtrack. I've seen the play on Broadway, and in several touring productions since. The movie added even more to the story, filled in some blanks, and gave me three hours of complete escapism entertainment. I'd see it again today, and I will buy it when it is available for home viewing.
And yes, I silently lipsynced through every song, silently singing in my head, right along with the actors on the screen. I gave them their opportunity to play the parts they were in, and I enjoyed myself, very much. And so did everyone else in the theater. it was a good time.
As for some people's concerns about the cast, I had questions, too, but I thought everyone did a fantastic job. I was thinking Ariana Grande was miscast, until I saw her on the screen. She was magnificent in the role. The rest of the cast was equally good, and collectively, they brought the story to life. The direction was superb, cinematography was spectacular, things flowed easily and comfortably, and I was almost sad when it ended - three hours later. Just an amazing experience. I cannot say enough good things about this movie.
If you see it, please sing to yourself, unless it's a singalong showing. I've seen those being advertised in some cities. Have fun!
Dave