Wow, yes this can be a can of worms.  Nevertheless, I suscribe to Louis Althussar's definition of ideology in his essay "Ideology and Ideological State Apparatuses" when a person goes against the stream of things then they are part of a "bad" ideology according to the state.  But everyone is subjected to an ideology since birth, since they recieced their first name.  But that is an argument in critical theory, not in my anecdoctal experience that can be taken apart by logic and reasoning.

"Schiller sprach zu Goethe, Steck in dem Arsch die Flöte! Goethe sagte zu Schiller, Mein Arsch ist kein Triller!"