Protestant Argument for Sola Scriptura

Whenever we question prots about how to know what is the correct interpretation of scripture and that 2 people with the same bible will have vastly different interpretations of the bible they always have the same cop-out answer: "People make mistakes. That's why we pray for the Holy Spirit to interpret it for us"

It's such a BS side-step to the whole question so how do we rebut it? How do we respond to that answer?