Coulthard said he was genuinely pleased for his team mate but failed to understand those who questioned his own performances.
"I lost the throttle on turn nine which I was told was due to a failure on one bank of the control system, " Coulthard said when his race was over.
"My car was well balanced for most of the race and I could conserve my tyres, so when Michael and Jarno got problems with their tyres I was able to attack, " Coulthard said.
"Honda, off the back of a bad season, suddenly when they realise they are up for sale start talking that this (their 2009 car) is a winning design and it's a great opportunity for anyone to buy this winning design, " Coulthard said.
The artist behind the Forest Pitch project, Craig Coulthard, said the quality of the entries had been high.
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"It's more difficult now than it ever has been to overtake, " said Coulthard.
"It is a fickle business, " said Coulthard, who retired last year.
"I am highly motivated to continue racing, " said Coulthard.
"What the public have to understand is that F1 is a bit like the Tour de France where there is a team leader and all the other guys are there to help him, " said Coulthard.
Coulthard, who is currently an F1 commentator, said driving on country roads took more than simply being aware of the basic Highway Code.
Kimi Raikkonen said a strike would "never happen, " while David Coulthard dismissed talk of a strike as rubbish.
Former F1 driver and BBC Sport pundit David Coulthard - whose raced for various teams in a career spanning 15 years - said that McLaren should aim to improve the car as much as possible as quickly as possible ahead of the next GP in Britain on June 21.
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