Being a bro isn't, like, something you're born into. It's a certain mentality, a certain way of approaching the world. And while I like many facets of bro-dom, and enjoy the hell out of sitting down for some Smash with a couple of friends and a six-pack of Yuengling, there are some bothersome things about bro culture which that particular category of game emphasizes.
I mean, I'm critical of the FPS as a genre to some extent. It's fun as hell, but the nature of how the genre's set up has given it some kind of crappy limitations that no game I know of yet has managed to overcome. Even the best ones, like the Half-Life franchise, are limited in ways that bother me. I'm also not super fond of hardcore gaming: it's cool to watch from afar, but it's not an especially inclusive culture, and I fear that games like Starcraft and League of Legends help to scare away a broader variety of players. I'm not trying to say that gaming was perfect before Halo came out; I do think, however, that Halo helped to push a wave of bright designers in some shitty directions, and that game design has suffered as a result.
I'm critical of "games that attract waves of bros", if the bros seem to be the majority of person attracted to a game, in the same way that I'm critical of movies that attract that sort of person. Adam Sandler movies, for instance. I'm not saying everybody who likes Adam Sandler is a bad person, but I do feel that Sandler movies are kind of puerile and limited in a way that appeals to a particular type of person, and that, to the extent that they influence other creators, they do some damage to our culture. Adam Sandler's influence on movie-making has been less impactful than Halo's influence on game design, so the mentality described in the OP does bother me somewhat. To hear a guy working at Microsoft say "my company specifically tried to manufacture this kind of experience to reach this kind of audience" pisses me off.