The filmmaker came face-to-face with members of the infamous Westboro Baptist Church at the event in Utah on Sunday (23Jan11) as they rallied against Smith's picture, which satirises Christian fundamentalism.
Smith recruited fans and his Clerks co-star Jason Mewes to help him picket, and they parodied their rivals' banners with signs reading, "God hates critics", "D**k tastes yummy", "Down with mutants" and "Thor hates straights".
In footage obtained by Showbiz411.com, the religious zealots can be heard telling Smith to "go to hell", while he fires back: "We live in America! Everyone's allowed to say whatever they want (and) make stupid s**t signs. I got some! Anybody can write bulls**t on a sign!"