I had an interview back in 2009 where the CTO of the startup asked me a question, I answered it, after which he very confidently corrected me with the wrong ans

I had an interview back in 2009 where the CTO of the startup asked me a question, I answered it, after which he very confidently corrected me with the wrong answer(!) Needless to say I didn't join them. The startup also went belly up about 6 months after I interviewed there. How do guys like this get funded?