The issue is not cell phones. Here is what seems to have happened:
1. Officer (employed as security by the establishment), walks into the theater and sees suspects behaving in disruptive manner. It does not matter that their activites are not illegal, because he is not arresting them...he is merely acting as security for the establishment. Private property rights, remember that? The movie theater has a right to decide if people can or cannot use cell phones on premises.
2. Cop asks them to stop.
3. They say no.
4. Cop, who is employed as security by the business, requests that they leave. Again, business invoking its right to decide who is allowed in or on their private property.
5. Suspects start to leave, then (apparently) attempt to assault officer.
6. Mace!
As always, I'm basing this on the news report, so who knows...but this seems to make sense to me.
Mike