Note that I explicitly called out the hyperbole of the statement. If the argument is that he got fired because he made this joke rather than because Adria posted about the joke, then surely it should follow that any alternative consequence could be subbed in, right? His employer was mad enough about his joke to fire him. Is it not possible that, in a hypothetical world someone else could be mad enough about the joke to cause him physical harm? And since it's his fault for making the joke, then it's his fault he got injured. Adria did nothing wrong, because he didn't get fired because of her tweet, he got fired because of his joke.

The idea is to point out that his private conversation would never have been made public without Adria, and Adria as a media figure should be able to see the negative consequences of her actions. There are better ways of handling the taking of offense.