I was waiting in a long queue for the loo in a coffee chain and saw a lady with crutches head into the disabled toilet. She came out while I was still queueing. Another lady further back in the queue caught my eye and offered for me to go in first. I declined saying that I wasn't disabled so wasn't entitled to use it. She then countered away to her friends telling them that she was going to use it as 'it was the law' that if it wasn't being used you could use it. I couldn't face an argument so just ignored her. It's still bothering me that I should have said something to her and corrected her.