Of course he's alright to mess with-- is Mercutio's silent answer, before he is entirely distracted by Claudius' next sentence. "He hath not met Sir Lancelot yet," Mercutio says, trying his best to think of other dark-haired swordsmen in the mansion. "Nor thy Laertes, nor Lan Wangji." Because clearly, clearly he's not the one being discussed here.