I think it was simply to show that Treebeard had been in Arda much longer than Gandalf, and so was in a way older than him. Almost like how Legolas called Aragorn and Gimli children on the edge of Fangorn Forest (which happens in the book).
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"Nazgul, Nazgul! You speak of what is deep beyond the reach of your muddy dreams, Ugluk! Nazgul! Ah! All that they make out! One day you'll wish that you had not said that. Ape! You ought to know that they're the apple of the Great Eye." ~Grishnakh
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