I don't think so. My clown girl refused F/T no matter what. Weighing a whopping 110g I didn't want to hold out longer than the month and half she went without eating. Offered live and she ate. Now she won't even eat live. So yes there are some snakes that won't switch. Heck this snake won't even eat at all right now. :/

From what others have said the squeezing releases endorphins which lessens the pain. The rodents die rather quickly.
I can understand certain circumstances. I just don't like it when people openly choose to talk down about feeding f/t. I see pics on this forum every month about live feeding mishaps. They happen to everyone who feeds live eventually too. I feel like most people don't try hard enough/don't know the best tricks for getting balls to eat f/t regularly. I really can't wait to finish my f/t tutorial video.

P.S. I didn't know that factoid about squeezing and endorphins. I hope it's true.