Barry Gardiner was mocked for offering a convoluted and evasive response to whether the left-wing party supported or denounced Donald Trump's airstrikes.
The ridicule came after Labour leader Jeremy Corbyn and his deputy Tom Watson gave contradictory responses to the US President's decision.
Mr Corbyn branded the surprise decision "wrong" while Mr Watson offered his backing to the decisive action.
Tom Watson and Jeremy Corbyn clashed again yesterday
During an awkward encounter on BBC's Any Questions, the Labour MP wavered on which side of the debate he came down on.
It was only after Dimbleby mocked Mr Gardiner for his "philosophical" answer that he backed Mr Corbyn's stance.
Initially, Mr Gardiner said that the United Nations ought to have been asked to sanction the action.
However, he refused to condemn the bombing, which was made in response to the horrific use of chemical weapons use earlier in the week.
Mr Gardiner in the end that he supported the Labour leader's response
Jeremy Corbyn and his deputy Tom Watson offered opposing responses to the US President's decision
You were a philosopher in your youth and I have to say that’s a pretty good philosophical answer
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At one point, the BBC host grew tired of grilling the shadow secretary and said: "You were a philosopher in your youth and I have to say that’s a pretty good philosophical answer.
"But, please, let me know ask more directly. Is Tom Watson wrong when he says it is a direct and proportionate response? Or does this, as Corbyn said, risk intensifying the situation?"
Despite denying that the two Labour figures were "totally opposed" in what they were saying, Mr Gardiner in the end that he supported the Labour leader's response.
Mr Corbyn branded the surprise decision "wrong" Celebrities and Politicians React to Trump's Missile Attack on Syria Fri, April 7, 2017
Following news of the attack, celebrities and politicians expressed their thoughts on social media
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Trump ordered a massive military strike against a Syria
Last night's awkward set of questions is the latest moment that has put rival factions at the top of the Labour Party on a collision course.
Following the missile strikes on Syria, Labour's Deputy Leader Tom Watson called them "proportionate" and said the regime's use of chemical weapons "must have consequences".
However, not long after this endorsement, Jeremy Corbyn came out and said the US should not have acted without United Nations backing.
He said the US attack risked "intensifying a multi-sided conflict that has already killed hundreds of thousands of people".