Yea, sure. No skeletons, no artifacts, no armor, no weapons, no tools, no homes, no utensils, no pottery. No evidence of ANY kind. All there are is hoaxes.
Plus the fact that giant humans are physically impossible. The record holder was nearly 9 feet tall and could barely walk. His legs needed braces and he needed a cane. He only made it to 22 years old. A 12 foot man would be unable to stand up. He would be an invalid if able to sustain life at all. No way a human heart could maintain the blood pressure needed to push blood up from his feet to his head. Impossible. No way a human skeleton could support the weight. Bones would snap.
So, yes, I do think.