It's a sad fact your parents will always figure they know more than you.
I've mad a lot of life decisions my parents never agreed with. Christ, I don't even live with them and I used to hear it too. One day, I got mad and said to them:
"Look I'm gonna do this - with or without you. You can either be supportive and help me or not. It's your call. But at the end of the day, I'm gonna do this."
This applies to just about anything. I said this line once. To this day, my parents will let me know if they disagree on a decision and why, but I don't cop lectures anymore if I've made up my mind.
- J.