You know, growing up in Iloilo and spending the summers in my grandma's farm in Ajuy, I have never heard anyone used the term tinegre, even from the old timers. It's always binangon. It was when i started collecting when i heard the term tinegre for the first time.
Now my old man, he's no collector, intimated to me that the term tinegre are those that were used by the bandits, whatever they may be. It connotes bad juju. That, and plaminkos.