My husband is from Louisiana and we have been here a year. We have not felt treated any different here because we are American. We are outgoing and find Kiwis quite friendly. I had a chance to help at a children's holiday camp here in Rotorua a few months ago and came across a 14 yr old boy from Florida who had lived here two years and a girl of 16 from Georgia. I asked how they liked it here and how school was for them. Both said that they would not go back to the States. The boy said that he had gone back for a few weeks on vacation and couldn't wait to get back here.
Best of luck to you