I haven't been to all of these cities, and have personally lived in only four of them. So I'm not qualified to have an authoritative opinion about the rest. My familiarity is passing with many of them. And as for those I haven't visited all I can do offer my impression of their reputation based on the third and fourth party accounts and stereotypes I've heard. Why should anyone care what I think about them?
Meanwhile, I'm middle aged guy who has lived or worked in 9 states in 3 continents. And who has traveled extensively besides. That's certainly far more than the typical respondent to this survey, who probably has ever lived or worked in 1 or 2 of them, and perhaps has visited a few more.
How many of the 2915 respondents of this survey do you think ever stepped foot in Detroit? Of those few who have, how many ever lived here? More of them probably got their opinion about Detroit from Robocop than from having ever even visiting here. Their opinion of Detroit is about as good as my opinion of Missoula. I haven't been there either.
My point: Even IF the theoretical margin of error is small according to some one-size-ostensibly-fits-all theorem of statistics, let's be clear about what this survey expresses. Simple common sense dictates it expresses nothing more than opinions of people who have little, if any, authority to hold them.
If we accept a sample of 2915 respondents out of a
US millennial population of 73,000,000 is enough to produce a small margin of error, that still means nothing more than that the survey is reasonably accurate about expressing stereotypes.
And what is that worth? Very little.