My friend tried hypnosis and it didn't work. It's fake, right?
Okay, let's unravel this before we jump to any conclusions. There are lots of reasons your friend might have had a less than ideal experience.
What were the credentials of the hypnotist? Maybe it was some guy who once read a book and was trying an induction for the first time.
Maybe your friend wasn't in the right frame a mind.
Was there alcohol involved?
Most people are unclear about whether they were hypnotized after the first time because it wasn't what they expected.
Did the hypnosis not work or are you saying the suggestions didn't stick afterward? Either way, I am betting the hypnotist was inexperienced.