There is a lot of wisdom in this quote but, it only lacks one thing, true friendship. A true friend will always want the success of his or her friends. To be sincere, I came by this bitcoin and this forum by friends and ever since, I've been helping myself through most of it and the forum contributed a great deal too.
What I think should be the best reaction to your friend is welcoming him or her into the field. Teach to him or her, let them drop all the ill ideas they've had about the field and then, teach them to see things from your own perspective and more. Only by teaching and learning can we correct the ills ponzis have left bitcoin.
Yup, even its hard to find true friendship out of friendships.
All it takes is a moment of trouble to see everything. I've been there, and it sucks.
In regards to your last statement, just add "Not Financial Advice" so you can't be blamed :p