How should i save someone from becoming a ninjer?
So i recently signed up at a new gym and i met a fellow newbie in my BJJ and kickboxing classes. Seemed like a cool guy, so i asked him why he wished to do these martial arts? he replied that it was for funsies and that he was always interested in martial arts but what he really wanted to get into was Ninjutsu. He said he found some classes that were "free" in Santa Clara, California.
So during this conversation, this little alarm went off in my head cuz honestly im pretty damn skeptical about ninjas and solid ninja training in this day and age. I just kinda smiled and humored him by asking him more questions.
My question for ya'll:
He seems like a nice guy so how do i alert/warn him about the possible false instruction he may receive from this location without hurting his feelings or coming off as a complete asshole?