I think I read a definition for a word that described that whole phrase (ignorant yet willfully arrogant. I can't remember that word though. My recollection is hazy but I think it described something like somebody who is from middle class or lower origin or visibly ignorant yet he is brazenly arrogant, not only that he scornfully refuses to change for better. It is derogatory/negative in meaning.
Help me find that word!
Thank you very much!