Paca and B have just gassed up the car. B is in his chair in the back and Paca is turning the key in the ignition. B with his window up waves at a guy filling up his car next to us who we have never spoken to or seen before.
B: Bye bye, firehead!
Paca: Why did you call him a firehead? That's not nice. He's not a firehead.
B: (quietly as if almost under his breath) Some people are just fireheads.
B may be right. But you aren't supposed to say it.