What is when a guy calls you dude?

When a guy calls you "dude," it is generally seen as a casual, friendly way of addressing someone, particularly among male friends. It may suggest that he feels comfortable around you and considers you a buddy or that he wants to establish a more relaxed, informal relationship with you. However, it can also be used in a more neutral or dismissive way, particularly if the speaker does not know you well or is not sure of your gender. Overall, the context and tone of the conversation can help determine the intent behind the use of "dude."