“You what, mate?” is fairly aggressive, it immediately makes me think of some dickhead in a pub taking offence to someone and looking to escalate to a physical

“You what, mate?” is fairly aggressive, it immediately makes me think of some dickhead in a pub taking offence to someone and looking to escalate to a physical confrontation (I’m British). Unrelated but “oi, dickhead” is what I shout at my cat when he tries to climb the Christmas tree for the nth time that day.