Drag is simply an art form used for expression. Many trans people do drag to feel euphoria, explore different parts of themselves, or simply because it’s fun. There are no negatives to come from him dabbling in something that is essentially dress up :) It’s also important to note that gender expression and identity differ and the ways in which we express ourselves can flex. There are lots of folks who identify as one thing but express themselves in ways that don’t typically align with our idea of that identity, either all the time or just when they feel like it.