If I recall correctly DeWitt thinks that this was a direct jibe at Plato, who held that you have to be able to know geometry in order to be a philosopher. I'll look for a cite for that.
Thanks for the insight. I just finished reading the last chapter today which, includes how DeWitt describes Plutarch’s attempt to defend himself.[Epicurus & His Philosophy, Chapter XV, p 351)]
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The result is labored but it possesses merits: it preserves much valuable information and it shows how the proud Platonists writhed under the shafts of Epicurean ridicule, a weapon to which pride is especially vulnerable.
Plutarch is an outright Platonist in his attitude toward Epicurus, and his writings should remind us that the original quarrel was between the Academy and the Garden.