ACR DEP FROM STL DURING SNOW CONDITIONS REQUESTED TIME AT RWY END BEFORE TKOF. ATC ISSUED DELAYING TAXI CLRNC.

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APCHING RWY 12L; #1 FOR TKOF; IN MODERATE SNOW AND HORRIBLE CONDITIONS; TOLD TWR WE NEEDED 2 MINS BEFORE TKOF. CTLR GOT AGITATED AND TOLD ME TO TURN L AND PROCEED ON TO RWY 6 TO MAKE ROOM FOR ACR Y TO TAKE OFF. UPON TURNING 90 DEGS L TOWARD RWY 6 REALIZED THAT THE RWY WAS DRIFTED SHUT WITH APPROX 1 FT OF SNOW THAT I WOULD HAVE BECOME STUCK IN. SO I CONTINUED TO TURN L ON THE TXWY AND TOLD THE CTLR ALL I NEEDED WAS ABOUT 1 1/2 MINS TO LOWER MY FLAPS; DO A CTL CHK AND DO BEFORE TKOF CHKLIST. THE CTLR THEN PROCEEDED TO DRESS ME DOWN AND STATED; I QUOTE 'ACR X; DO YOU THINK IT IS FAIR TO DELAY ACR Y 2 MINS TO WAIT FOR YOU TO BE READY?' HE THEN PROCEEDED TO CROSS ME BACK OVER RWY 12R; MAKE A R AND TAXI ME ALL THE WAY DOWN TO RWY 12R. MEANWHILE THE SNOW WAS GETTING HEAVIER AND NOW I WAS HAVING TO REALLY CHK MY HOLDOVER TIME. ALL THIS TIME I AM ACCUMULATING SNOW FROM MY WHEELS ALL OVER MY ACFT. SO AS TO NOT INCONVENIENCE ACR Y FOR 1 1/2 MINS; HE DELAYED ME ALMOST 20 MINS; CAUSED ME TO ALMOST GO BACK TO THE GATE FOR DEICING; ACCUMULATE SNOW ON MY ACFT; AND PUT ME IN A VERY DANGEROUS SITUATION. HE JEOPARDIZED THE SAFETY OF MY FLT TO GET ACR Y RIGHT OUT. THIS CTLR HAS TAKEN THE WORD 'CTLR' TOO LITERALLY. HE PUT ME IN A COMPROMISING POS; AND WAS THE MOST UNPROFESSIONAL CTLR I HAVE DEALT WITH IN ALMOST 30 YRS OF FLYING.