Many gifted kids have more aware of the subtleties in your voice and actions than you think possible - they will know when you feel threatened by them and/or are intimidated by them and will pick up on the slight differences in the way you treat them, which will turn them off from you and your class.
Remember that the parents of gifted kids are not "that parent" who think that their child is amazing and has nothing to back it up with. Along with this listen to what they are saying so that you can actually understand the child in your class rather than just nodding and saying "oh, I've had loads of gifted kids before I know all about them."
Don't be afraid to ask the child if his/her needs are being met and if not how things need to change to make the situation better.
