Out Of Line In Every Way

I work in a clothing store, in the shoe department. Our store is set up so that customers have to get in line when they want to get a shoe scanned to check to see if we have the size. I helped the lady at the front of the line to get the shoe size that she wanted.

After I helped her, another woman came up to me and started yelling at me.

Woman: “I got out of line to sit in one of your chairs, so I was here first!”

Me: “I’m sorry, ma’am.”

I thought that would be the end of it. But no. She kept going. 

Woman: “I’ve been waiting for you, and I just wanted to sit down, but now you’re helping someone who hasn’t been waiting as long as I have!”

She continued rambling until one of my coworkers came to my rescue and helped her.

Why get mad at me? How am I supposed to know you’re in line when you’re not in line?