I don't think he is offended by anything you said per se. I think the issue is trashing another city because of the poster's own insecurity is counterproductive to the discussion.
Here's how you can reword your post so that you can sound like an adult, rover.
"If they're sticking to a robust transit network as in subways and commuter rail, this is a much more narrow contest than it first appeared. Atlanta, Charlotte, and Austin are out. We can exclude the cities with transit but have a high crime rate (Baltimore, Philly, Detroit) and who's left? Boston NY, DC, Chicago, Denver maybe (not sure of Denver's transit situation)."
By the way, high crime rate doesn't necessarily rule out any cities. Unless the entire city is in the middle of a war-zone, there are pockets of area that do not see significant crime. That's why cities like Philly and Chicago, both cities with high-crime rates, are still large business centers.
I can trash any city I please provided I've actually been to the city and seen it first hand. I've heard bad things about Oakland for example, but as I've never been I couldn't say. I was in Philly earlier this month. Baltimore a couple of years ago. They're both dumps in my humble opinion. In Baltimore's case, the city is depopulating. That is not my opinion. That's a fact. We're all entitled to our opinions. We're not entitled to our own facts.
Furthermore, crime rate is in fact a big factor because it speaks to a dysfunctional city and usually poor leadership. For example, while it has many things going for it, Chicago has more murders per year than NYC and LA COMBINED - even though put together those two cities have 5 times the population. No, the senior execs of Amazon probably aren't going to be hanging out in the South Side. But, do you really want to locate in a city where the headlines every Monday are 500 people shot last weekend, but only 50 died? Yikes. If these places can't get that under control, you have to wonder what they can be functional at (transit, educating the workforce, etc etc).