Sarah DeLappe and Kristen Roupenian’s savvy screenplay has a keen ear for your therapy-talk and personal branding of now’s 20-somethings, when the first-charge ensemble works by using its significant charisma to help make their people fascinatingly repellent; the “Shiva child” and “Bottoms” star Rachel Sennott as well as the “S.N.L.�