I'm really disappointed that Solaris picked a "let's screw Linux" license, relegating some otherwise interesting technologies to only run on Solaris, on permissive OSes like BSD, and on systems that don't care about license compliance.
Our belief was that Linux would be unlikely (and unwise as the overall system architecture is sufficiently different that it would be hard to port) to take the code. We expected - and encouraged - the concepts to be taken (as with the slab memory allocator).
[citation needed]
Reaching feature parity and taking Solaris' market share was an often cited goal by people in the Linux community, and one they achieved.
That said, I don't remember much actual hate directed at Sun in the way that Microsoft got. As far as companies go, Sun was a better member of the UNIX community than most.