I have a female like that. She is 2 years old though and has been on live he whole life. She snaps at me, not the F/T, but when she misses me and snatches the rat she will coil around it but not eat it. F/T and live smell different. Even us people can smell the difference so snakes know. They also sometimes have a hard time finding the right end to start eating at and then they lose interest. This is quite common, and I find it more common with F/T eaters.

Getting hissed at usually is just a warning but once you have them in your hands, they can be the sweetest animals in your collection. I personally do not know why this is what they do. I can only guess that you are huge animal, and big animals scare the little ones. I honestly cannot say.

You can keep trying F/T all you want. I know I never give up on my live eaters. I waste food doing so but to me it is worth it.

Good luck