Why does every thread about Rails on HN devolve into a thread bashing Django? Do Rails users have some kind of "little brother complex" compared to Django?

Every Django thread on HN usually involves a healthy amount of discussion about the pros/cons of Django, and it's really helpful. You would expect that Rails threads have a discussion about the pros/cons of Rails, right? Except instead, every Rails thread also turns into a discussion about the pros/cons of Django.

If Rails is so good then why do its users feel they have to constantly defend itself against non-existent attackers?