Though Mercutio seems sarcastic and disrespectful when he speaks of Romeo they are obviously close friends.?

Mercutio's sarcastic remarks towards Romeo are often a sign of their close friendship, as teasing and banter are a common way for good friends to interact. Despite Mercutio's teasing, he cares deeply for Romeo and his antics show a sense of familiarity and camaraderie between them. Their bond is evident in their shared history and the way they support each other in difficult situations.