Okay I feel the need to say a few things here.
I may not have posted anything on this but I have read the thread where the situation in question did happen, so I am informed on it.
I would like to point out that everyone who says "What people say on the internet can only hurt you if you let it" is dead wrong.
Like what has been said before, some people do not have a choice as to how they react to certain things. People have pasts and mental disabilities and so on which makes it very difficult for them to be able to control the way they think or react to something that's said on the internet. And you can say "Toughen up" and "Don't be so sensitive" all you want, but it doesn't work that way for everyone.
I have a friend with some pretty severe mental disabilities. About a year ago, she got into an incredibly heated argument with someone over the internet. She literally almost died from what was said because of her mental disabilities. It stressed her out so much taht she kept having episodes and doing dangerous things because she wasn't in her right mind. Not only this, but she endured massive amounts of physical pain as well due to the fact that... well I can't remember exactly what she said, but it was something to do with erratic waves in her brains. Do you think if she had a choice to not react that way, she would choose that?
Note: The person wasn't at all suicidal and in fact is usually incredibly happy about the state of her life, despite her various medical conditions.
What if the incident in question had gone as far as to cause the victim's death? Would you still be defending the person who made the offensive joke, saying, "Well they shouldn't have been so sensitive..."
Also, was an apology ever made? Because I'm sure that people would be more willing to resolve this situation had the person who made the joke apologised to the victim. If an apology was made then that's good, because although the situation shouldn't have happened in the first place, the person who made the joke at least realises that what they said was wrong. If not, then the only thing that I can see that meaning is that the person who made the joke condones being totally insensitive to everyone else in life, including their history and/or mental disabilities, and make controversial jokes and comments even if it one day results in the death of a person.
Like what has been said before, some people can NOT control the way they react. However, people CAN control what they say... I believe that we all, as adults, have a responsibility to not say things that will cause this kind of reaction in other people, and it is never the victim's responsibility to react a certain way, particularly when the circumsances make it that they cannot help the way they react. This will help make sure that nothing harmful is said in the first place, so we can avoid situations like this. It's called being considerate and having respect for people.