It's been interesting watching Apple and Google get more negative comments on Slashdot over the last few months (or the last couple of years in Apple's case).
I think the criticism of Apple is partly because of their inherent need to have control, which clashes with a community of geeks who love to hack at things, find non-obvious/non-intended uses for them, and just generally gain more knowledge. That then boils over when, like you said, some Apple fans are so quick to jump on any criticism at all (see: Reality Distortion Field).
Google, on the other hand, has a lot to do with privacy and their enormous databases. I also think that after seeing what happens when one company becomes too big/has too much control (Microsoft), the slashdot crowd is being a lot more vigilant to possible abuses. It seems too many people are quick to implicitly trust and not question anything for no other reason than "It's from Google", which can easily lead to bad things when left unchecked, as it did with Microsoft.