Why can't people enjoy their outings without having them be disrupted by noisy kids?
And why would noisy kids at a kids movie be considered disruptive?
As far as I'm concerned noisy kids are never a disruption, they are the sound of life, the sound of joy, and the sound of our future! Whether that child is giggling and gurgling or screaming its little lungs out it always brings a smile to my face and a bit of sympathy for the poor mother you know wishes she could shut the child up.
Whether the woman is a liar or not is not a call I'd be willing to make. But the asshat that got them kicked out is undoubtedly an asshat regardless of the circumstances.