Why does the handle of a metal spoon got hotter than a wooden spoon?

Metal is a good conductor of heat. Wood is not a good conductor of heat, although I wouldn't exactly call it an insulator of heat either.

If you put a wooden spoon halfway into a pot of hot water, the dry part of the spoon will not get hot even though the wet half will be as hot as the water is, if you leave it in for a while.

But if you heat up a wooden spoon and keep it dry, let's say by leaving it on a baking sheet and baking it in the oven along with some cookies, you may be able to grab the spoon and pick it up even though it's hot. There's no way you could do that with a metal spoon because you'd "feel" the heat more with metal. The heat would be conducted from the metal spoon to your skin, but a wooden spoon won't conduct much heat to you.