Michael Pachter, an analyst for Wedbush Securities, told Bloomberg that the Facebook CEO’s decision to show up for a meeting with potential investors dressed down in his trademark casual outerwear suggests that he’s too immature to run a massive corporation.

If nothing else, Pachter’s take (and he still thinks Facebook is a solid investment) reinforces the inevitable culture clash that occurs when a 27-year-old titan of California’s freewheeling startup culture meets the buttoned-down world of Wall Street.

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