Here is something they never taught me in my teacher credential classes two decades ago: how to confront the first signs I am perhaps losing a step in the classroom. I’m not a hipster in my fashion, not woke in my politics, and certainly not hyperaware of the modern trappings of youth culture. I don’t understand the humor of their tweets, the witticisms of their memes, or the drollness of their one-liners. Eventually, after voluminous explanation from my students, I…