It sounds to me like your parents are playing favorites, and you aren't the favorite. Worse than that, they are also playing anti favorite, and you are the anti favorite. People sometimes get that way when they have a non typical child. In such cases they will tend to frequently find fault with the non typical child, even when there is no fault. There was nothing wrong with what you said, so it does seem to be a case of your parents looking to find fault with you. I'm sure they don't realize consciously that they are doing this. You need to write down what they are doing, and give it to them. If they can see what they are doing written down, they may try to change. Give it a try, and I hope it helps. 
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau