And by the way, I consider myself to be Chareidi, and I speak out against “onaas devarim” and loshon hora and being nice to people far more often than I speak out against chilul Shabbos, and so do most Chareidim I know.
All the Chareidim I know, if they saw someone they knew engaging in the behavior you speak of, would certainly say something to them. The thing is – I don’t think that anyone I know knows anyone like that!