This is the proverbial: if someone smart starts by telling you that they are unsure or that it depends, (in a field you are quite sure they know something), then you had probably better listen to what they say: at least it will not be rubbish.
On the other hand, dogmatism is frequently a way to relieve insecurity.
The elitism isn't shocking anymore, but it is sad and limiting. I want to hang out with / work with a programmer like this as much as I want to hang out with a religious zealot. Which is to say not at all.