cmeilim, Eva does that too with the spoon in the beginning. It takes them a while to understand and learn that it's not how a spoon works. She now knows that it's not a good idea to turn the spoon upside down but sometimes she forgets. LOL. Just give your boy a bit more time, ya?
I bought the suction bowls because Eva sometimes will attempt to grab the bowl and tip all its contents out. But more importantly, it helps keep the bowl in place so it's easier for her to self-feed (if the bowl moves, it becomes more of a toy and a distraction). You dont't need to buy a lot. Just one or two is good enough.