B733 DEPARTING LAX IS FRUSTRATED WITH ATC'S VISUAL SEPARATION APPLICATION.

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ON TKOF FROM LAX RWY 24L; THE TWR ADVISED US OF TFC ON TKOF LEG FROM THE S COMPLEX. WE ACKNOWLEDGED THE TFC VISUAL CONTACT AND THE TWR IMMEDIATELY TURNED US INTO HIM ON VECTOR OF 210 DEGS AND DIRECTLY BEHIND HIM ABOUT 2 MI ON TCAS. WE WERE UNABLE TO KEEP VISUAL WITH THE NOSE UP ON DEP SO I HAD THE FO TURN SO AS TO KEEP THE TFC IN SIGHT. WE WENT TO DEP AND LEVELED AT 3000 FT. I TOLD DEP THAT THE TWR HAD CROSSED US DIRECTLY BEHIND AND IN THE PATH OF THE OTHER TFC AND DIDN'T THINK IT WAS A GOOD IDEA. HE SAID HE WOULD TELL TWR. AS WE CONTINUED; I SWITCHED TO THE #2 RADIO AND LAX TWR AND TOLD THEM MY CONCERNS. WE CONTINUED WITHOUT INCIDENT. MY MAJOR CONCERN WAS LOSING SIGHT OF THE TFC WE HAD ACKNOWLEDGED AT A CLOSE 2 MI RANGE AT VERY LOW ALT. I WAS ALSO CONCERNED ABOUT PASSING THROUGH THE JETWASH OF AN AIRBUS AT APPROX 2 MI; SLOW GREATER THAN 200 KIAS; AND LESS THAN 2000 FT. THERE APPEARED TO BE NO REASON FOR TURNING US SO SOON AND RIGHT BEHIND ANOTHER ACFT. IF THIS IS DONE AS A ROUTINE MATTER; IT SHOULD BE STOPPED. I DID NOT FOLLOW THE TWR'S INSTRUCTION AND MANEUVERED SO AS NOT TO FLY DIRECTLY BEHIND AND THROUGH THE JETWASH.