I think you missed his point breh, although he didn't state it that clearly.
He's saying that while engineers are smart people, they often lack the interpersonal skills to communicate and work in certain situations. They often can't communicate the significane of technical jargon to the laymen, sound familiar? He's also saying that there's a certain entrepreneurial mind set that engineers don't usually have, because theiy're so equation and formulaic minded when it comes to solving problems. Basically, he means thinking outside the box and being creative and making emotional appeals. Often times big decisions are made on things more emotional and "gut feeling" rather than based on formulas and mathematical formulas.
So instead of looking down on him because he didn't take "real calculus" you could have explained the differences and collaborated, instead you took the petty route...nice interpersonal skills