Who Are You To Say?

 Greg Koukl:

Who are you to say?”  That challenge works both ways.  First, if my disapproval isn’t legitimate, then why is my approval legitimate?  If I don’t have the right to judge something wrong (“Who are you to say?”), I certainly don’t have the right to judge it right (“Who am I to say?”).  Second, why is it that I can’t make a moral judgment here, but apparently you can?