As I stated in the other thread (about respect for the HMs and their friends and family), it goes to far when there are attacks based on race, gender, sex, sexuality, family situation, disability, and appearance. Those aren't things they can exactly change. As much as I have seen with this season of BBAU (particularly in relation to the appearance of some HMs), it is nothing to what has been happening on US BB15, which I had to stop watching, because it was really uncomfortable to see.
Also, which I may get flack for, I really don't like, and think it goes to far, when people throw around terms like "whore" and "slut". For me, they are inherently misogynistic. I don't think being more liberal sexually is something that should be criticized. Thus, someone who cheated should be criticized for the cheating, not for liking/wanting sex or affection. (I have the same issue with men using the term "bitch" but that would be way off topic.) The situation with Tully and Drew (if it is even real) has gone too far. Especially as most of the people commenting on the situation do not know either Tully or Tahlia.
On the other side, I know they have put themselves in this position, so attacks on personality and/or actions are too be expected. In the end you are on t.v., being seen by the public and should expect some negative comments.