Question

Hi, recently a discussion flared up in my office after I told them about a friend of mine who is very “locked into” his path. (He studies in a yeshiva, etc. etc.)
My coworkers took very badly the claim that there is one way to live—“the way of the Torah” (or any other path you choose)—and that no person has the authority to determine that someone else is mistaken in his path. (Even if that is only in his own thinking and perception, of course.)
In their view, each person can claim only what the right path is for himself, and the claim that there is one path for everyone is unacceptable—in essence, the claim that a person cannot say what the right path is for someone else besides himself.
I objected and argued that, similarly, just as my friend from yeshiva claims that he is living the right way and they are mistaken, so too they have also decided on a path that obligates everyone—the path that says each person may decide only for himself. But that very determination is itself some truth that, in their view, obligates everyone.
Therefore, in my opinion there is no difference between the two outlooks. 
I’d be happy to hear what you think. If I’m wrong, please help me understand why, and if I’m right, I’d appreciate help formulating the argument better.
Thank you very much!