Having run a few ~60m 10k's and being a horrible sweaty oik, I'd say two things:
1) he's right, you don't technically *need* water when running for an hour; however, it's a lovely thing to have on hand and very gratefully received.
2) sounds like a ****tty attitude to me, he's treating learner runners like they're seasoned atheletes which is bad form.
I can't think of a biking analogy, but I can think of a climbing one. "If your shoes don't hurt, they're too big." Yeah, true, when you've been climbing for sufficient years to where you need more aggressive kit to progress, but for most people it's outright bad advice.