It's possible that she may not be a regular customer or goes in on days that you're not there. I'm sure you're a great worker!

Did you forget to ask if she wanted fries with that? Don't worry, some people are just never satisfied.

Maybe she's used a different style of working? Idk but you're probably fine OP

That's when you tell her you technically haven't even started yet and are entirely self-trained. Instead of being disappointed by how long you've been at the job, she'll be surprised by how capable you seem despite your lack of experience!

"You haven't seen someone more experienced that me since the Eisenhower Administration"

Sounds super passive aggressive to me! Sorry OP!

I kept my "trainee" badge for as long as possible to stop people asking me questions I couldn't answer. I worked in a hardware store with 0 product training and people would ask me questions such as "which of these is best for using to build my house with?". I wish I could've given proper answers.

Well some people are just rude like that. They will say that even though you are doing a great job.

Lets not jump to conclusions now.

No, customers are just idiots. I had somebody comment on how I must be new after I'd been at my last job for 5 years. They wanted something wrapped up in shrink wrap (it was a rug, I'd sold many many times before, most people took it as is or maybe tied it up with something so it didn't unroll itself, nobody ever wanted the whole damn thing wrapped) and I was supposed to like physically know that, and since I didn't I clearly didn't have retail experience at all *eyeroll*. Don't worry about it. Customers think the world revolves around them and they expect you to know everything while at the same time assuming you're a complete idiot who knows nothing. Sometimes you can't win and no matter how good you are at your job you will always get customers that think you suck.