yelling at idiots idiots never work. Doing so imprint a snapshot of whatever they were doing deeper into their brains. Our brains take intersections of the zipped archives of situation logs and turn that into reproducible scripted acts. Negative emotions associated with the memory won't help the brain unlearn undesired behaviors, it just makes us sadder or angrier at scripted points.

A better, but painful, way is to somehow break the chain of undesired acts until they would be obsessed with better things to do.

Maybe there are even better ways at it and I'm mostly wrong about this - I had never taken any training to be a behavioral scientist - but my point is, point-and-screaming wrong things someone did never goes well.