This is my point, though I should have made it clearer to start with.
The thing is, to what extent is it a general responsibility not to hurt the feelings of someone in that situation, and to what extent do such people need to be able to take responsibility for their own feelings?
Some jokes about abuse are pretty much guaranteed to offend everyone; others may well be offensive/hurtful to some who have been abused; and others will only be offensive to a minority of people. Where do we draw the line?
I think that the jokes being made on this thread have fairly obviously been made to achieve a polemical point - in other words, it's not just a bunch of mouthbreathers cracking oh-so-funny abuse jokes, but people attempting to make a point, perhaps in response to your reactions.
I do believe that humour does have its role to play in this, because I think that it is important to make sure the subject doesn't continue to be taboo, and if jokes are part of the process of opening up debate, then they have their place. There are abuse jokes that would offend me, but I haven't seen any of those here yet: it would seem that your own threshold is a little lower, and that's perfectly OK.
What isn't wise, though, is to challenge those jokes merely by saying they shouldn't be made. If people don't want to offend you, then they will need to know that you are offended; but they themselves may be offended by the implication that, just because you're offended by them, they shouldn't make them. So it comes down to a fairly simple choice, in my view: if we're offended by what someone has said, we need to make that clear, but we have to stop there. If they are not ignorantly making them, they will hear what you say, and take what they consider to be appropriate action; if, on the other hand, they are making them with the specific intention of causing offence, then what you say isn't going to make a lot of difference, and may even encourage it to happen more.