As a fan of the filmmaking brothers David and Nathan Zellner and their offbeat brand of humor and awkward storytelling style, I had much higher hopes for “Sasquatch Sunset” than I guess I should have. Disappointingly unfunny and too reliant on gross-out gags, this weird movie about the antics of a bigfoot family is a massive misfire on every level. This absurdist film is set up like a bad nature documentary, a strictly observational look at a year in the life of a sasquatch clan. There’s the alpha (Nathan Zellner), the female (Riley Keough), the male (Jesse Eisenberg), and the child (Christ...