Yeah, some people just engage in performative outrage to get clicks. And there's always an audience, unfortunately, for sexist or racist whining about how TV isn't made exclusively for and by heterosexual white men "anymore" (even though inclusiveness has been around for longer than many of them have been alive). I haven't seen Halo either, but it looks like it has a very diverse cast, which is enough to earn a "terrible" rating from people who can't see past their prejudices.
It always bemuses me how misogynists think their kneejerk outrage at any participation by women makes them look tough and macho, when all it does is make them look fragile, whiny, and terrified by the very existence of women.