Came here for answers...

I watched this movie while drunk. I thought it was just me. Thank god I wasn't the only one confused. I never had an "aha!" moment.

It’s a fly on the wall movie. We, the viewers, are watching this weird family and their strange way of dealing with each other. The family is a repressed, non-verbal, group on the whole. The graffiti on the car was one of the most frank, though vile, expressions made. That and Ryan calling them all rednecks and storming off, lol. I expected the Dad to support him and yell an F you at them, then pack the car and go. But they stayed. Then it boils down to Keith using/abusing his daughters in a twisted revenge scheme on his sister? There are weird, troubled families out there, and this film gives a glimpse into one of them.