What you described sounded like a one time event, a nasty remark voiced while in a particularly bad mood. What happened with these two here though, was not a one time event, but an extended campaign to cloud the boy’s feeble mind and shape his behavior.
She knew he was highly suggestible, and many boys that age will be with young girls. She knew he had few other influences in his life that could counter her suggestions. This boy seemed to feel both inferior and deeply depressed. This gal must have known how the end result could look, and like a film director(or like the Intercom voice of your own consciousness), she hectored him in order to achieve that result.
It was more than one remark, or text. She sent him a series of texts telling him to go through with it after he expressed second thoughts. She is evil. Read the whole story.