I wonder if I was rude

So this morning I was in for Interstellar. There was a young couple seated next to me(probably college going age). They kept talking throughout the first half. This girl had doubts for every scene and the guy who was perhaps a former NASA scientist kept explaining. It was extremely annoying. During the interval I asked the girl if they could refrain from talking loudly during the movie and she looked back at me as if I had said something extremely unpleasant. I looked away. Of course it was a lot quieter post the interval.