I'm sorry, but from my experience, what you get from a bricklayer is what you see. If he's making a mess of the faces of bricks, that's the way HE lays bricks. Since bricklaying is such a repetative procedure, whatever method is used on one brick is used on them all.
Even if I'm laying bricks down a trench to be backfilled, I still keep the faces clean. Not because I want to, It's just force of habit. It costs no exta time so there's no point getting them dirty, just for the hell of it.
One job I did, was to replace all the sleeper walls in a house. The customer was so happy with the result that he fitted a trap door in the floor and some lighting, so that he could show off the brickwork to his mates. (weirdo eh?)
When you have rough faced bricks, it's inevitable that you'll get the odd
rags on the edges. These should be removed with a stiff broom as the work progresses.
Check to see if your chap has a broom in his toolbag. If he hasn't you may have to accept that he's gone over to the dark side and is beyond redemtion.
He may not realise that it looks bad
Bricklayers are more accutely aware of what the brickwork looks like than the casual passer by. Believe me, he knows.