Garnett's dislike of Zynga's games is very similar to my dislike of the Twilight franchise. When the first one came out I think a lot of guys took their girlfriends to see that movie not knowing anything about it. I know I did. My girlfriend at the time was very excited about it. I thought it would be of the same vane as Interview with a Vampire, a good movie both of us can enjoy. That wasn't the case. Twilight was a lot like movies on the Lifetime channel, a bad movie made to appeal only to women. Not intentionally bad but bad none the less. Anyway I walked out when one of the characters began to sparkle. I was very angry and upset at the movie but unnecessarily so. While the movie is terrible, I wouldn't have been angry, or better yet not have seen it, had I known that I was not the intended audience. That movie was for women.
Zynga's games are of that same vane. To me, Garnett gets angry at the simplistic nature of the game and the design of it from a hardcore gamers standpoint. Zynga has said though, most recently at GDC last year, that their games are not for hardcore gamers. Their games' audience are women. To be even more specific their games' audience are women who watch soap operas. So getting angry at that game would be like a heavy metal music listener venting about how much he hates opera music. It may be bad but it wasn't made to appeal to him in any way, it was made for another audience.