Is my dad right to be so obsessed with grades?

[malificent7]

So my dad is a teacher and was keen for me to get good grades which sounds great but it was his sole focus. He sent me to a private school coz small classes and I absolutely hated it...bullied etc, didn't fit in bit he had convinced he did the right thing as I got ok grades ( not stunning btw).
Now dd has gone to the local comp and loves it , is doing well at 6th form . My dad is convinced her grades would be higher if she had gone to private school. Aibu to tell him to shut up? She has literally been doing alevels for 5 minutes since September and is doing great.
He also told dd that he wished he'd sent me to preo school....i'm bloody thrilled I didn't go and went to my normal state school first.

My exdh is obsessed with grades and all 4dc started private school in y7. Dd3 is doing IB and he's already going on about grade 7s and she only started in September! I did try and persuade dd3 to go to our local state secondary as it is much better than when her sisters, now in their 30s, would have gone but she wanted the same as them. I don't think anyone should be made to feel bad about their grades and your dad should back off.