Research from Harvard and MIT shows that the "serve and return" of conversation—the back-and-forth between adult and child—is a vital factor for healthy brain development. We aren't just talking at children; we are creating a flow that builds emotional security. However, for a child to feel that security, the "return" they get from you must be something they can actually understand and trust.
While joking with coworkers keeps the day light, sarcasm creates a barrier with children. They are literal thinkers. When you use sarcasm—like saying "Oh, great job!" when they spill milk—you aren't being funny; you are being confusing. Children lack the developmental nuance to detect the "joke." Instead, they feel mocked in a way they cannot process. Even when you are "just kidding," they feel the sting without understanding the intent.
To maintain a secure connection, your language must be clear, kind, and age-appropriate. Trade cleverness for clarity to remove the guesswork from their day. Your goal is to be a safe harbor, not a comedian. Choose direct, encouraging words, and watch how much more confident and cooperative the children become.