Is it wrong that I just bought something to annoy my parents?
Why did you get something that would annoy your parents?
It was not because of my parents, but I want to use it to piss them off
That's not a good reason to buy something. I think that you need to rethink why you are doing things like that.
WTF. The idea is not to give a fuck about authority.
Buying something just to annoy your parents wrong and it is a childish act and a waste of your money. You would get more respect by giving respect to your parents.