http://www.hebrewbooks.org/pdfpager.aspx?req=887&st=&pgnum=274&hilite=
It’s a shailah whether or not he has the din of a melech, but even if he doesn’t, there should be some level of respect given.
It’s one thing to criticize his policies, or even his behavior, if the point is to learn something from it (which actually might have been the case regarding the OP), but the immature name calling is wrong.