Very interesting. I'm 25 and last year, I had a similar experience with two much older interviewers. I was getting pretty hostile vibes from one of them, and he at one point gave me a problem with many possible solutions, of which my whiteboard program would print one.

Then I was asked to modify it to print all possible solutions. When the second interviewer verified that it would work as expected, the other guy was like, "but you never used list comprehensions in that." -- I threw in a list comprehension to satisfy him (although at this point, I'd started questioning the worth of all this). Next, I was told that I'd used a (max 10 element) list for random access of items instead of a dict, and that "he'd never do that". At that point, I lost it and said some pretty blunt things to him. Of course, I was rejected.

I don't know about other countries, but big services companies in India have a lot of incompetent senior programmers who simply hate any kind of opposition to their authority, and you simply have to blow them to survive. I am fortunate to have never worked at one of these companies.