Why do you care what I do during the movie? There were multiple people in my aisle who were discreetly tapping on their phones.
Sitting next to someone tapping away on their phone during a movie is distracting and saying that other people are doing it as well is just a childish excuse.
If you have to ask, any answer I could give probably won't change your mind.
But here's a hint: The light from a phone screen is distracting in a dark theater.
You are bothering people not just in your aisle, but those behind you as well, who can see the light from your phone from the corner of their eyes, but are too far away from you to point it out.
So do the rest of us a favor and put that phone back into your pocket.