Since I am in angry old man age range (older than Dave and told him so) - it's just a silly worry. His comments are well taken. Mocking what he called the 'beefalos' - like me - trying to quickly exit a car - well, he's right.
I've taken classes from young SWATish guys, Middle aged scientific types and angry old men. They are all good experiences if they personally are good teachers. Dave is quite worthwhile.
If you don't have a thick skin in today's age to handle factual critiques, go on Twitter and tweet about it.