Next time - key they car - you can pretend you are just walking alongside it with your bag touching it.
People like this lady are just pig ignorant and use their misunderstanding of the englisg language to their advantage.
My mother is disabled and i have a blue badge for her - i only use the blud badge when she is shopping with me and never use it when she is not with me because i know how people like my mother would feel if they had to walk further becuase of some pig ignorant person who does not give a toss.
Then i walk past the disabled parking and see lots of cars parked there without blue badges - then i see some of them walking back to their vehicles and believe it or not they arre all foriegners. I have approached one or two myself but i get the same response you did.
Some people think it is petty - but only people who work with or who have disabled families will understand how annoying this can really be.
Were are manners!!!!!!!!!! Gone along with the british way of life.