Parents worrying about school

I take Chemistry 3/4 this year at school, and I got my first SAC results back. I got a 96 and the second highest score at my school. My mum was really happy with that, but I told my dad and he has flipped it. Saying that if I had studied harder I could have done better and that out of my siblings I am the disappointment. I try so hard with my school work but unlike my other siblings I do have a social life. I am the youngest child and they are used to 98% children, I'm just not like that. 
My mum is super supportive and sees the toll this unobtainable standard Dad puts on me. What should I do how do I put aside the fact that my Dad called me the disappointment.