Avril Lavigne's Ex-Husband Deryck Whibley Gets NICKELBACKED in Halloween Diss-Fest

Deryck Whibley tried to drop a Halloween insult on his ex-wife Avril Lavigne -- but ended up getting verbally slayed by Chad Kroeger ... which is about as humiliating as knowing the lyrics to "Photograph."Check out TMZ on TV -- click here to see…