Here is my theory on why you have met hostility.
The neighborhood I just moved out of had about 5 businesses on it 14 years ago when I moved here (most the storefronts were boarded up). Now it has more than 40 or 50. They have a block party on that street. I worked the first block party on Mississippi about 8 year ago. You could swing a dead cat and hit no one at that block party, it was one block and was sparsely attended. Now they have the second biggest block party in the nation, you have to push your way through the crowd in a party that stretches 10 blocks or so.
The neighborhood I work in was a bit gritty and shitty eight years ago. I could play Bad Brains in the bar and most the patrons were into it. Now there are more than 500 nice apartment units going in just the two blocks of the bar, and certainly a bit of charm has left the bar as the neighborhood got 'better'.
Almost no one is from here but after they have put in 4 or 5 years they think they are a fucking pioneer. The neighborhoods they came to love are totally changing all the time and it's because the money and pressure of all the new arrivals. Never mind that this has probably been going on since WWII, most people don't have the perspective to realize that this shit has been in a constant state of change before they arrived.
It's a hard to town to find work in, a lot of that is blamed at all the new people moving here and competing for work.
I think you'll find people to be very friendly in general but don't be surprised if you run into someone who doesn't like you because you just moved here.