Reminds me of the old days, when I was told by a snotty young instructor that I would not understand relational database because I had never worked with them. I explained to him that instead of the database telling me what the relationship is, I actually had to hand code those relationships, so I certainly understand how they work.
Same thing happened with me. I was not hired because I did not understand how to use a relational database?
Good God, I could creat my own software to do that simple task!
But, the stupid people only asked if I knew how to use thier specific relational database.