My LO is 16 mos now, and we still go through phases where she doesn't want me to spoon feed her.
So when that happens, I try to give her less messy finger foods.
Does your LO like holding the spoon while he tries to eat with his hands? If so, try guiding his spoon hand to scoop up some food and guide the spoon to his mouth.
Is he just objecting to YOU holding the spoon while feeding him? Maybe he really wants to try on his own. Of course, he'll need some practice. You can try loading up the spoon, then offering it to him so that he can grab onto the handle (while you help suport it too), then guide the spoon to his mouth. He'll love the feeling of being able to do it himself.
I think the motivation to eat will help him quickly to either learn how to use the spoon and/or learn how to pick up food with his fingers/palm. That's how it worked with DD.
Our early finger foods included the Gerber fruit/veggies puffs and Cheerios. We also broke up waffles & pancakes into tiny pieces. Tiny cubes of yams were also a staple in the house. Banana and avocado were good foods for spoon training cuz they kinda "stuck" to the spoon better than other things. Is he doing cheese yet? Tiny cubes of soft cheese work well, and not too messy when it falls.