Sounds like your Budgie has a better life, and I thank you for that.
What my mom did was wrong. Once you know a little about Parots, you just realize how wrong my mom was. I've watched documentaries on parots. They are family birds, that is a quality they share with humans.
They are happiest when they are with their family group, flying around, and doing what they do. Ever see them do a mating dance to court females, its fascinating stuff, much like how Peacocks do their little song and dance to impress females as well.
But to keep a single parot locked up in a cage 24/7, its just wrong, and thats why that parot hated its life and everyone, it wasn't meant to have a life like that.
Stick a human in solitary confinement for life, see what happens to them. Well, its not good I can tell you that, which is why its against the law to have a human in solitary confinement forever, they don't do that in jails/prison because its not humane.
You can be put in solitary for a certain amount of time as punnishment. But, not permenant. Anyways, like I said, your bird has a better life. But parots must be with other parots.
There was this lady I was watching on Youtube, but the video's were taken from a TV show. She had a whole family of parots at her place. She was training them and everything, flew all over the house.
But she knew what she was doing. You could tell she was an expert, she knew how to train them, she knew how to gauge the moods of her birds, and alter accordingly. She knew just how far to push them in training, and when to quit.