manna
oh dear! ds also used to get grumpy at mealtimes and i finally came to the conclusion that he used to get bored... he loves his finger foods, but doesn't seem to have much patience with spoon feeding. what we have found useful is to swap the order of his meals. i used to give him his finger food first while getting his "main course" ready - i think this filled him up and by the time the rest turned up the edge had been taken off his hunger and he was looking for new distractions... now what i do is either give him the main meal first and finger foods later or just give him a little bit of rice cracker etc to be getting on with. i've noticed he is less grumpy and more ready to eat.
i'm going to try another strategy shortly, giving him his food in sandwiches so that he can feed himself more.
i've done my best to give him plenty of different flavours, avoid sugar, salt and give him healthy stuff, but nevertheless, he is quite fussy and prefers sweet tastes - plus he doesn't eat much either. sigh.
i'm sure many people will disagree, but at 10m i think he is too young to feed himself with a spoon - although i always give him one to hold while i'm feeding him - it amuses him briefly! "mummy has a spoon, and baby has a spoon!" being a regular mealtime chant in our house!
we also used to take "time out" from meals if he seemed to be getting irritable - i would sing songs, or give him a toy to play with for a few minutes, this sometimes did the trick.
manna, there could be many factors putting him off at the moment, he could be getting ill, he could be teething, it could be the chair, it could be frustration that he can't feed himself, it may be that you will never work it out and have to resort to the parents' mantra "it's only a phase, it's only a phase, it's only a phase"
anyway, try not to let it stress you too much, i'm sure you haven't given him bad associations, most likely it will resolve itself in a few days or sooner.
good luck!