I have a 16-year-old son. I’m in my early 30s (had him very young) and a professional footballer. My son also dreams of becoming a successful footballer (he’s been playing since he was 6), but he’s just… not great. He’s good, but not great - and in this extremely competitive industry you need to be at least great in order to even stand a chance. So I told him, as someone who’s been doing this for a very, very long time & is active in this sphere, that he should find another, more attainable dream. He took it as me not believing in him, but I’m just objective and realistic.
You have make the call about your opinion of his talent. We can’t know.
If you are looking to ascribe a pejorative term to your behavior the consider this.
If you are wrong you may a dumbass, but since you are doing your best to help the kid, you are certainly not a jerk.