Twitter is the only way Trump has to get his opinion out. Of course he could write an opinion piece for WaPo or something, but who reads that garbage... and WaPo would probably reword whatever he sent in anyway.
I seem to recall one Obama statement, I don’t quite remember the topic but it was “you’d think they’d be thankin’ me! That’s what you’d think!!!” Some crap he was shoving down conservatives throats.