Linux users tend to be sometimes fanatic in their support for their favorite operating system. The power of their convictions may be very impressive, but that shouldn't be the only reason to believe they're right. On the other hand, the average Linux user is somewhat more knowledgeable than the average individual when it comes to computers, so there's a higher chance that he knows what he's talking about.
Windows doesn't seem to have that many true fans or they're not that vocal.