The bias you people have is truly amusing, but not surprising. Every time that disorder of hers manifested in this chapter, the fireball launched in a random direction--after all the illness just generates a fireball. The time she found herself emoting over the MC, though, she took aim in addition to generating it. Milly was right to seek her neck, this was the usual abusive (read: murderous) tsundere double standard at work.
Perhaps it's just that she's the only flat chest amidst a bunch of busty girls that's got you all putting on the white armor.