She's an author so she should (theoretically) be concerned with the meanings of words and sentences. This statement is about how it takes real mettle to deal with prosperity (one of the trappings of which is power). Any man can deal with adversity, but only a few can handle prosperity.
In the end, the quote is praising Trump, not trolling him. But this should be expected from an author who is so lazy she never thinks about any deeper meaning or how things might be impacted later in the story, or, if she does, it's referring to the next page.