So, do you think your friend is definitely not up for learning how to work through this, find training and guidance, learn how to work with astral projection...instead of turning away from it?
Of course, like any other thing in life, one has a choice whether to pursue development in something, or not. There's no reason why he has to if he really doesn't want to. If it freaks him out too much.
But being able to do this is a kind of talent, or ability. (even though I know it is scary....believe me I do know, as I have had some well scary stuff too when going out of body, as well as some interesting things)
Because of my own lack of perfect control of out of body experiences, I can't really offer good advice on all the "how-to's" (or "how-not-to's") But I'm certain other people on here could help such a lot.
But perhaps it would be a shame if he passed on this ability of his because there is a lot of fear?
Doing something like this is always scary. Plus he may be meeting entities which scare him because he is centered mostly in fear when he goes out of body. I have a feeling he could learn to overcome this stuff perhaps, with the right learning, and guidance....