Trump could spend three hours rambling to his crowd about how fat, stupid and gullible they all are and they would still vote for him. He couldn't make them dislike him no matter how hard he tried.
When he comes to big cities his crowd isn’t from the cities. That’s just where the venues are. The crowd comes from the surrounding suburbs and rural areas. People in rural and suburban Michigan are terrified of Detroit.
Some YouTube videos I saw pointed out a subtle sound that happens after he makes the Detroit comment that does indeed sound like a fart. Might not be. It's real subtle.
Suburbs. Detroit has been a “donut” city, hollowed out by flight to the suburbs. It’s finally starting to come back but it’s surrounded by wealthy suburbs who hate Detroit