The answer of course is that Donald Trump doesn't consider anyone who lives in cities (filled as most are with liberal governments who resist his autocracy and filled with people who didn't vote for him) as Americans at all, and will do everything in his power to hurt those cities by abusing his office. His base follows suit.
If Trump loves America, why does he call our cities ‘disgusting’ and ‘embarrassing’?
That is because Donald Trump, like most people suffering from narcissistic personality disorder, is driven purely by petty vengeance and bitter hatred for anyone who doesn't agree with his worldview that he is the most important human being on earth. The concept of anyone not agreeing with how great he happens to be is so alien to him that anyone who holds that view offends him to the point where they must be destroyed.
This is a man who has fever dreams of shutting off every single federal dollar to cities like New York and San Francisco, causing racist riots so bloody that their local governments are overthrown and that the new people that rise swear public fealty not to America, but to Trump himself. This is what he wants to do, and he will incite this violence in his base for this purpose every chance he gets.
Here endeth the lesson.