I think pretty much everybody has a natural fear of snakes, including those of us who keep them. We're definitely not indifferent. I guarantee there are people who have no natural fear of snakes, but they would be insignificantly few.
But we can definitely be conditioned to react in different ways to them. Some of us see a snake and become curious, others want to flee and some people want to attack. Children haven't been conditioned yet, which could explain why they react so differently to snakes. In short: genes + environment.
