I was lucky enough to have all 4 of my grandparents growing up. When I went through the inevitable stage of urrrghh grown ups at that age my GP’s had very different reactions. My paternal GP’s guilt tripped me, tried to buy my affection and were generally very clingy, which made me mistrustful of them and want to retreat even further. My maternal GP’s especially my darling Papa were the exact opposite, they’d give me a call through the week for a quick hello, we’re always interested in my life and my friends and were a constant place of safety for me. As a result I gladly spent time with them as an adult, I loved them with all my heart and I miss my Papa in particular every day. I did eventually get on a better footing with my Paternal GP’s when I had my own children, but that was a decade later and tbh, although I did love them there wasn’t the same emotional closeness, more a sense of duty.
My point is, your GS is becoming a young man, spreading his wings - let him fly, be proud of your input because you’ve influenced the person he is and the man he’ll become. If he’s like me he’ll appreciate the room to mature and grow and he’ll come back to the fold and love you all the more for it.