He could have made the couple of points he made worth making without all of the douchebaggery. Also can't tell if he's just trolling with all the stuff about Unix vs Plan9 and calling Rob Pike out as an amateur or if he's just woefully unaware of the history of both Unix and Plan9. In either case the first paragraph is illuminating as to whether any of this matters to you:

"In the process of working on getting cgo to work on illumos, I learned that golang is trash. I should mention that I have no real opinion on the language itself; I’m not a languages person (C will do, thanks), and that’s not the part of the system I have experience with anyway. Rather, the runtime and toolchain are the parts on which I wish to comment."

For anyone not working in the internals of the golang compiler/runtime, as long as the language is good and the tools produce the proper output when given the proper input, who cares whether they offend someone who writes only in C (and keep in mind I say this as someone who wrote code in C/C++ for almost 15 years, and still has a very soft spot in my heart for C... but not C++, fuck C++).

There seems to be a separating line between people who love and hate Go (well, one of a few such lines) which involves the Go team's convention of making stuff that should be scary for most programmers look and feel scary (see: unsafe package, some of the stuff in cgo, etc). IMO, they take the right approach (keep the easy stuff easy, make the hard stuff possible, and warn of landmines [both explicitly and implicitly] early rather than later) but some subset of people seem to get offended by these choices and lose sight of everything else Go offers.