Do you use tongs? I would recommend them, if not.

I stand off to the side of my tank as I feed and try to only present the feeder hanging from its tail by the tongs and as little of my arm as possible. If i stand to close it makes my BP standoffish and slow to react.

Like the others are saying. They may not be warm enough. I use warm water to warm the feeder in a ziploc like stated above.