My first encounter with trans was in the early 1950s, when Christine Jorgensen became the first widely known person to undergo “sex reassignment” surgery. I remember some of my peers mocking Christine by threatening to swap the feminine lips and masculine mustache between Mr. and Mrs. Potato Head. After some laughter, eye-rolling, and snide smiles, seven-year-olds settled the issue: It was ridiculous — we called it crazy — to believe that Mr. Potato Head could become Mrs. Potato Head any more than a man could become a woman. The trans issue reemerged with the Reimer twins, Bruce and Brian. In...