The hate for GRB goes a bit beyond the usual ABI bashing. There was a lot of oddness to the way they launched that was antithetical to what I suppose a lot of people consider the "craft way" with basically coming in with a crap ton of capital, initially sizing to 15 barrels and then purchasing a 50 BBL system before they even opened. A lot of blustery rhetoric about how they were LA's biggest craft brewery and they were different than other craft brewers because they weren't just a couple of homebrewers opening a brewery, but folks with professional experience, etc. All in all, very much a Saint Archer profile with slick marketing and meh beer quality for the longest time.
Damn shame, because I really like a few of the players in the business and a number of their employees who were shocked at the acquisition.