And providing facts to back his opinions wouldn't be hard if he was serious about making good points.
"Given that a high percentage of business school classes funnel into Wall Street and multinational corporations, it’s also a given that any top-tier MBA has classmates are all making ridiculously high salaries and have extremely powerful jobs" --> Really, what's the percentage? Do most MBA grads get "ridiculously high salaries"? How about doing some actual research and backing these opinions with facts.
For example - http://poetsandquants.com/2013/08/15/mba-pay-hbs-vs-duke-tex...
Points out that the median salary for Harvard MBA grads is only $120k, hardly what I'd call "ridiculously high". Duke and Texas are even less. You see, my argument is now much better now that I've provided a fact, rather than throwing around a baseless opinion.