Generalized animosity from a parent to their child is the not the same as seeing a niche interest that most likely won't work out based on facts.
You're giving survivorship bias for two completely different situations. He's not telling his kid he can't do anything. He's being very specific, and that specific thing is also already very difficult to obtain for anybody, let alone those with great skills.
"make up a situation that doesn't/won't apply to you and see if that changes your mind"