Don't be ridiculous.
Having the sort of reaction outlined by the OP is ridiculous, just because people are eating or have to go to the toilet. Many children can't sit in a cinema for two and a half hours without having to go out halfway through. It's hardly a major disturbance.
The problems in cinemas are caused by people who won't shut up, who think it's fine to just talk at their normal volume, who constantly kick the seats in front, who answer their phones and send texts, who run up and down the stairs for no reason other than to cause mayhem, who clearly have no interest in watching the film but are just using the cinema as a place to 'hang out' and talk loudly, who make stupid wisecracks based on stuff that's happening on the screen, and who generally don't know how to behave in such a setting.