News flash! Trump knew all along that Walker would not endorse him. Now that Walker has officially endorsed Cruz it is in Trumps best interest to minimize the endorsement. Thats what Trump is doing. Its called politics!
I wasn’t commenting on what Trump was doing, as you point out that is expected. I’m more amazed that Trump supporters accept that particular criticism, even trying to justify it as somehow acceptable
Compare Trump's reaction to Ted's tweet reaction to Palin's endorsement of Trump below:
"Ted Cruz @tedcruz I love @SarahPalinUSA Without her support, I wouldn't be in the Senate. Regardless of what she does in 2016, I will always be a big fan. 12:55 PM - 19 Jan 2016"