It's definitely offensive, egotistical, narcissistic, and pretty much symbolizes most of his loathsome qualities, but he's also just trolling the libs as always. He knows he triggers them and makes them angry, and that his supporters love it when he does that. To a great extent Trumpism is a political movement that doesn't actually care about the realities of the world we live in, it's a kind of mass cult reality show where "owning" your opponents online is one of the few things that actually matter to them, and gets them out of bed in the morning. His cult loves shit like this, because they know it angers the people they hate.