Why did you do that
It is difficult enough to be seen as a teen by adults regarding tastes and interests without dealing with self-understanding of learning and behavioral patterns too.
Adults don’t seem to like your clothes, music and even choices of food and friends. That’s ok, you are an individual and you need to realize that not everyone will agree with all of your choices throughout life. Your parents and grandparents are not “wrong”, they base their likes and dislikes on what they grew up with or are familiar and comfortable with as the standards they use to measure and judge others.
As a teenager everything seems normal and reasonable based on what you know, but is it really in the world of the responsible adult? Unfortunately, it is not. That is one of the major reasons why parents respond the way they do to your actions and desires. They have the life experience that allows them to see what you cannot.
The vision to see that you do not “know it all” only comes after you get years of real life experience. Unfortunately, by that time you have most probably already made the mistakes that you could have avoided if you had only had the vision when you were a teenager. So parents mean well in trying to guide you properly by sharing their vision.
The thought processes of the human mind and specifically frontal lobe development continues well into the mid 20’s and possibly the mid 30’s and exhibits a very complex set of learning and development patterns in teenagers. This is what helps to determine “why you did that” when you don’t really know why you did.
On top of that there are some things that you enjoy doing that might inhibit or slow your mental reasoning and functional development. An important part of becoming an adult capable of making choices and decisions that will be taken seriously by other adults, including parents is in realizing that you are not yet and still have a lot to learn and a long way to go in life experience before you are.