Maybe he called you that because of your rude response. I understand you spend countless hours on the forums everyday and you are tired of people asking the same questions but try give a contructive reply next time. You know you don't have to reply to EVERY thread.
To answer the OP's question.. Nope their will not be a PSN user name change unfortunately.. The most easiest way to change your username is to make a new account with a new email address simple as that..