Alex (Claire Danes) and Greg (Jim Parsons) are young Brooklyn parents of the new middle class in “A Kid Like Jake”: progressive, acutely involved with their child’s development and a little self-congratulatory about how not self-congratulatory they are. As their 4-year-old, Jake, nears school age, they talk the talk about wanting to support public education, but also about wanting the best for their smart kid. Jake is more than just smart. As Judy (Octavia Spencer), a family friend who also supervises Jake’s preschool, points out, he enjoys “gender-expansive play.” When Alex and Greg refuse to allow him to dress up...