Out on the York castle walk walk, my daughter declares she needs the toilet. Luckily near a retail estate so trundle off to the Gregg's. Husband buys a bottle of water so we can use the loo. Me and two daughters go in to the only cubicle. Whilst in there someone repeatedly tries the door. Twice I say, sorry we're in here. I can hear her saying I don't know if anyone is in there and her little boy will wet himself soon. Trying the door again, I say louder sorry we're in here. She then says sorry I couldn't hear you. When we come out she tells me how rude I was to raise my voice. My question is, was I rude and else should I have handled this?