It's not hard to find Linux users shit-talking Solaris - or "Slowaris" as it was known at the time. Just browse the Slashdot archives.

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.