"Yes," Bayard says, unsure whether he should add a 'sir' to the end of that even though Karkat's older. Finally, he says it almost reluctantly, as if trying to append the idea that Karkat near lost his sirring privileges by being rude to start. Granny wouldn't look well at Bayard withholding manners from people. "Sir."

He holds his hand out, seemingly as reluctant to that as to call him 'sir'. It's not because he's scared of Karkat. It's just a matter of not liking to be put in his place as a child. "Bayard Sartoris. Why do you cuss so much? Don't no one make you wash your mouth out for it?"