Any thing he wants to say makes he first tweets it, then if it gets picked up as something that catches the news cycle, he then starts verbalizing it.
So because Trump thinks this is newsworthy, it is newsworthy for this political cycle until he is defeated in the presidential contest.
Some of his tweets(thoughts) that you may not have seen:
Hey and if you want to dye your hair purple knock yourself out, you never know it may work for ya.