I'll agree with you that people should be educated in advance about parrots -- or any animal -- before they buy them. However, I disagree that the chain pet stores do not properly educate their customers. I personally received a rather long lecture from the sales clerk in charge of birds before they let me take a parakeet home. They even held the bird upside down and showed me the tail vent, saying this is where they poop, if the stool gets runny and if the tail vent becomes discolored, it could mean the bird is sick. They counseled me on proper diet and gave me papers of instruction.
That's point. You did not educate yourself about what is required to own a bird like this before you walked into the store.
It sounds like he was an impulse-buy. Had you planned to buy a budgie when you walked into the pet store? Or, like most people, did you go there to buy some pet supplies and decided to buy a bird on a whim?
It is good that the store from which you purchased your budgie took the time to tell you a little bit about his care and feeding.
Did they also tell you that there are thousands of budgies just like him, who are in desperate need of adoption?
Did they suggest that instead of buying a baby bird, you should first contact the local rescue to look into adoption as they now do with dogs and cats?
Or, did they work to sell you a bird from their stock? (Along with a cage, perches, bird seed, toys, etc.)