The woman was being the Big B, and I don't mean Boss.

Actually, you could have some fun with this... (insert evil smile here)

The next time you're going to that theatre, remove from the bag anything that looks like a weapon, drugs or firestarters.

Then add a few extras. They should be as senseless and inoffensive as you can make them: a small teddy bear, a couple of adult diapers, a whole box of paper clips, a notepad and pens, a wool cap, some 1/4" carriage bolts, etc, twelve pairs of prescription glasses from a thrift shop. Etc.

Then walk in. If they pull the same thing this time, politely ask them to call the police, or ask if they want you to do it. Let the police search your bag.

She will probably end up looking like an idiot.

Sue, who likes to tease fools