Why would anyone who hates Ray Comfort pay $20 to leave a bad review?
I can't believe the majority of negative reviews came from people who were willing to give Ray Comfort their financial support, and then turn around and blast his movie as homophobic, unscientific, biased, etc. They obviously have never had an objective view about homosexuality. They've always been in support and they are lashing out against anyone who presents any evidence against their preconceptions.
If they saw the movie, they pirated it.
I get criticisms like it's too expensive, or it's too short, or he's spent a lot of money just to do interviews, or he crowdfunded this but obviously made much of the movie before he got funding. Those might be legitimate complaints, but if your complaint is that he's homophobic, then you would never pay $20 to see the movie.