Ours didnt eat anything by spoon until 10mos old, due to several issues. We were told she was fine. I DID decide to make "concoctions" in the bottle, though. I would take 4-6oz formula, plus some stage 1 or 2 baby food, maybe a little fruit and a little meat, whatever, and add them in. Not much, just to keep her on having things of that kind of taste in her diet. But it was probably unnecessary.
I would back off for a could weeks. Chuck the spoon. Try offering the simplest of finger foods, like pieces of banana or Gerber Graduates Finger Food Fruit/Veggie Puffs (they melt in baby's mouth), or just cheerios. No, he doesnt need teeth to eat, he wont choke. Just keep things the size of your fingernail or so.
If you dont offer anything at all by spoon, he may forget why he had any aversion to the spoon at all. If it continues, talk to your pediatrician about seeing a Speech Therapist who specializes in food aversions (they deal with it because its a matter of the mouth).
But chances are, its just a phase, one of many he'll have in his childhood about food.
Whatever you do, do NOT force him to eat. It will only make things much, much worse both now and long into the future.