The faux outrage is hilarious coming from Trump and his supporters. How many times has Trump railed against political correctness? But now that Cruz said something politically incorrect about New York, it's a different story, i guess.
It's a telling posture for Trump to take. It shows just how much he is all about performance and no substance, willing to take whatever position gets him where he wants to be. He has no underlying principles that determine his positions, only goals to achieve. Trump is the classic ends justify the means politician, i.e. Democrat through and through.