Reasoning by perceptual recognition. Cryonics seems weird and involves money, therefore it's perceptually recognized as a scam. The fact that it would be immensely labor-intensive to develop the suspension tech, isn't marketed well or at all really, and would have a very poor payoff on invested labor as scams go, will have little impact on this. The lightning-fast perceptual system hath spoken.

I'm surprised that you say your friends are computer programmers. Programmers need to be capable of abstract thought.