When the city of Friendswood, Texas, announced on Facebook that hometown hero Haley Carter would be the grand marshal for the town’s famed Fourth of July parade, the post was peppered with excited comments. Carter, who was in the Marines and is a retired professional soccer player, was just the type of person residents wanted to see lead the parade. Then the right-wing culture warriors showed up. Conservative radio host Jesse Kelly tweeted the same day that Friendswood had appointed a “gun-grabber” who is “into drag” and “trans activism” to lead the parade. Kelly is from Ohio, ran a failed...