there's no opportunity to defend yourself from a tweet? tweet back. certainly you agree twitter is effective now that a bunch of racist, sexist scumbags used it to harass her company into firing her.
she did not destroy anyone's career; he made an off color comment at a tech conference, someone reported that he did so, and his employer made a decision to fire him because of how it reflected on their company. had he not said it, she'd have nothing to report; had his employer not agreed that it was inconsistent with the public image they wish to present, they would not have fired him.