There was a story on a number of mainstream news sites the other day about a law suit being filled against Trump for rape of a underaged girl. Even the the the reported wrote that the lawsuit was suspect. I myself wouldn’t post the story because it was to me CLEARLY suspect, but even you know that if the same suit had been filled under the same circumstances agains Cruz it would have been not only posted multiple times on FR, but most Trump supporters would have believe it and beleive it to their grave.
I know the story you mean, and I had the same reaction, including that some angry Trump supporters would believe it forever. I find it sad that even conservatives are that easily manipulated by the media. CNN, MSNBC, NPR, and the rest want us to hate each other, and they are playing up any story that will split the Trump and Cruz voters. Some Trump voters are way past the point where they are no longer rational about Cruz, and the same is true but to a much lesser extent about Cruz voters.
Part of their anger is because Cruz won't drop out. I won't go into detail yet online, but I voted for Trump a week ago and I am more grateful than I can express that Cruz is still in the race. Part of the reason is that Trump will have enough delegates for the first ballot, so it won't matter, while Cruz is choosing more reliably conservative delegates. Trump isn't considering much other than the delegate's pledge to vote Trump. Having Cruz still in the race makes it much harder for Jeb/Rubio/Kasich to replace Trump with a pro-Amnesty candidate, and the Trump voters are missing what Cruz contributes to that entire dynamic of the convention.