There's no reason to be insulted by this quote. Either Mark is wrong, and someday he'll learn, or he's right.
When kids say mistaken things about stuff they don't understand, adults usually just ignore them because they're confident they know better. They don't (ordinarily) get upset. I think people denounce a quote like this for being naive and get upset about it because they worry it might be true.
I doubt they would care if they weren't worried it could actually disadvantage their employment prospects. The tech community is full of fads and it's hard to know which will catch on (regardless of whether they reflect reality or not).
When kids say mistaken things about stuff they don't understand, adults usually just ignore them because they're confident they know better. They don't (ordinarily) get upset. I think people denounce a quote like this for being naive and get upset about it because they worry it might be true.