Support him. Trust what he wants out of his education, he knows what he's doing. Don't automatically trust others about what they say is a normal educated mind and what isn't. The people who go on to do great things or revolutionary things in science could probably relate a great deal to your son. In my opinion, he's damn lucky to be mentally strong enough to defend himself intellectually based on academic reasons and not simple bias. Start looking into advance placement programs for college for him. I'm not sure of what age you have to be to begin formal college coursework, but he should have access NOW to college level text books to the level of his competence. Don't forget that everyone learns at a different pace, with sometimes extreme polar strengths in different areas, acquiring those strengths on their own at earlier then normal ages.

Don't get drawn into the nonsence of what others will tell you is normal and what is not. If he is only 14 and is already at the level he's at then that's a good thing. He'll spend more time on his research and less on suffering through his adolescence. My guess is that he's already processed what he's needed to on that front during his earlier life......Take him to see a hypnotherapist to see what your son has to say subconsciously while under hypnosis about the first few years of his life if you don't believe me.

Sorry to be so blunt, I dealt with exactly what your son is dealing with now in his life when I was younger, and I'd hate to see him have to deal with what I had to deal with from the public educational system. My knowledge was just in a different area of science.