My six pennorth, FWIW, real abuse is the deliberate targeting of individuals with hate messages and death threats!
Such as, indeed, happened to OH after his comments (which were not targeted, i.e. sent directly to individuals) were placed on an open forum/blog
If I read somewhere something which I find offensive, then too bad. If I open an email, or receive something on Faceache or Twatter that I find offensive sent to me directly (such as a death threat), then that is another matter.
There are too many people running round trying to make a career out of "being offended". Bloody ridiculous! Get over it . . . . .