It's this. Everybody else's take us missing this. I play a BUNCH of musical instruments, and when people are like, "Oh wow, how did you learn to play all of those. You must be so talented!" And I always say, "Time. Time and a lot of practice. And most importantly a LOT of patience with myself".
The thing is, to get good at something, you have to be bad at it first. And many people simply do not have the passion to keep pushing through the part where they're bad at it.
When I was in school I called my teachers liars/misinformed/uninformed all the time. I just didn't have chatgpt to summarize why, so I actually had to read a book if I wanted to make that claim and back it up. There's nothing wrong with disagreeing with your professor, you shouldn't trust anything that anyone says blindly, ESPECIALLY FUCKING CHATGPT