Once again the media have to spend time and energy reacting to a tweet that took trump 2 minutes or less to post.
Trump is done with it but the media will be consumed with it for days.
No damage to Trump at all.
On their part the lying media would talk trash about Trump, his family, his cabinet, his pro-American policies, all while pretending to be serious. That will not change no matter what Trump does or doesn't do.
Where they failed miserably starting in 2015 was their anger management. Instead of taking Trump light heartedly and using ridicule, they went pretty much straight to the anger stage. They staked their low remaining popluarity on beating him, and lost their entertainment value. Their only remaining viewers are a minority of Angry-Americans in pussy hats.