yes, yes, yes!... I got a sandwich at a shop one day.."No onions, please.."...and got in my car and headed down the road, unwrapping sandwich to find....onions! Even though I was late, drove back to shop and plonked bag on counter saying, "I asked for NO onions". The girl in the corner who had made it looked up with this WELL! expressions and said, "I like onions!"
.....I think it's almost a hopeless cause.

I did get one guy trained at a shop where I was a semi-regular for a few months. After watching him do this automatic dip into the onion bin several times and making him start over, he finally looked up at me and said..."Oh, hi...let's see, you want a slice of red onion between 2 slices of white onion-right?" I never had any more trouble...there.

I know one woman whose idea of making soup was to cut up a bunch of onion...then see if she had anything to go with it!

(I can put up with small amounts of onion as deepbackground flavoring in some dishes, as long as I can't actually identify any pieces)