I remember that one of the most weirdly antagonistic Q&A sessions I've attended at a film festival was because of a major plot hole.
This indie movie was going pretty good, but at the two thirds mark there was something that happened that effected the entire plot, but was objectively not reasonable. I know that it kept me out of the film for almost the rest of the running time, trying to figure out if there was something I missed.
The very first question during the Q&A was about this plot hole. (Well, I thought, at least I'm not alone.) The director and the writer both sort of shrugged it off with an answer that was almost like a politician would give - they rephrased the question into something they wanted to talk about and then answered THAT question. However, the very next question. from a DIFFERENT audience member, was about this plot hole as well. Amazingly, again they tried to deflect.
The third audience member asked point blank: "So did you even realize as you wrote it, or as you were making it, that this was problem, or did you only realize it after it was made?" They answered" "Well, I don't see it as a problem."
And that's when a fourth audience member chimed in: "Well it obviously is, because we're all asking about it."
The director and writer then got defensive saying that it is a "story and a movie " and "we were trying to do something different and a little experiemental."
Audience members pointed out that nothing about their ensemble, indie thriller/comedy seemed "experimental or avante garde." The whole thing got really uncomfortable and I was actually happy when the moderator said, "Well, we're going to need the theater for the next movie, so I guess we'll have to end it there."
I always think about this event. I realized something while watching it unfold. If this had just been a bad movie all around, the audience probably would have just shuffled out before the Q&A, and nobody would have cared.
However, because the movie was actually pretty good, and we were all invested in the plot and the characters, this lapse in logic and structure kind of pissed people off more than it would have it was in a crappy movie.