Not just hateful but threatening, and filled with vengeful but impotent fantasies of the girl being raped in this life or going to hell in the next. My untutored guess would be that they are frightened and insecure about their own beliefs and therefore feel deeply threatened by a challenge such as this.

It's likely there are other social dynamics going on here that may have little to do with Christian ideology, for example displaying loyalty to one's perceived group (Christian identity may be only one of its characteristics), feelings of antipathy towards outsiders, and publicly establishing social distance from someone who's been ostracized in order to bolster one's status. Regardless, the inability of Christianity to install basic civility in many of those raised under its influence, once again demonstrates its impotence as a source of morality.