Why can't she use the word scum? Particularly when it's at an internal conference not meant for public ears. No matter where your political allegiencies lie, everybody comments on how out of touch with reality politicians are with their eatonian upbringing and jobs for the boys mentality. She comes from a "normal" area, used a word that's commonplace in the surroundings she's grown up in and lives in she's being accused of dragging politics into the gutter by the Tories for a solitary word. To me, thats far more offensive. I suppose it would be perfectly okay if she had used a word thats at the very least mildly racist but sounds funny because nobody has used that word in the last 80 years.
Nothing wrong with what she said and good on her for refusing to back down at the slightest sight of an extreme overreaction from the media.