To ERA, having a happy, stable marriage free of click bait drama is secondary to the cause of uplifting women. They see him putting him and his wife first over female streamers as an unconscionable crime. But what is even more amazing is how they are dismissing the threat of harassment Ninja, and more importantly, his wife would go under. Which is a position extremely antithetical to ERA's history of taking online harassment seriously. If you try to dismiss the threat of harassment in any other context on ERA, you'll get a ban real quick.
Basically, Ninja refuses to make his marriage a sacrificial lamb, and they are mad about that.