Nàxiē rén xiǎng dòngyáo tā de dìwèi, búguò shì pífú-hànshù.
Those people trying to shake his position are just ants trying to shake a tree.
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Shortened from Han Yu's poem 《调张籍》, written against critics of 李白 and 杜甫: 蚍蜉撼大树,可笑不自量, 'an ant shaking a great tree, laughable, not knowing its own measure'. 蚍蜉 is a large ant.
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Contemptuous. Used of others who take on something far beyond them, never modestly of yourself.