A320 IS TOLD TO ABORT ITS TAKEOFF ROLL FROM RWY 15R AT BOS; BECAUSE OF AN EMB145 ON A TAKEOFF ROLL ON RWY 22R AT THE SAME TIME.

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FLT BOS-LAS SCHEDULED DEP XA09 ACFT WT AT TAKEOFF 16400;1 F.O.B. WX CLR 12 DEGS C; WIND 190 12. AT XA29 WE WERE CLRED FOR TAKEOFF ON RWY 15R. PRIOR TO 80 KT CALLOUT (APPROX 75 KTS); TWR CTLR ASKED US TO 'ABORT TAKEOFF' (VERY CASUAL VOICE; NO REASON GIVEN). SUBSEQUENTLY NOTICED REGIONAL JET DEPARTING RWY 22R. EXECUTED REJECT. AUTO BRAKE MAX AND FULL REVERSE BROUGHT ACFT TO A FULL STOP JUST SHORT OF TXWY NOVEMBER. NO HOT BRAKES ENCOUNTERED (MAX 200 DEGREES). ANNOUNCED OVER PA 'REMAIN SEATED; SIT UNDER CONTROL.' REMAINED ON RWY FOR APPROX 5 MINS DUE TO BLOCKED EXIT TXWY. TAXIED CLR OF RWY THEN MADE PA TO PASSENGERS REGARDING REJECTED TAKEOFF TO REASSURE THEM. HAD FLT ATTENDANTS DO A CABIN WALK THROUGH TO CHECK FOR ADVERSE PASSENGER REACTIONS. COMPLETED AFTER LNDG AND TAXI CHECK; THEN CLRED FOR TAKEOFF. UNEVENTFUL DEP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR'S CONCERN WITH THIS EVENT WAS THAT THE LOCAL CTLR THAT ISSUED THE ABORT MESSAGE TO THEM HAD NO SENSE OF URGENCY TO IT. THEIR VOICE SEEMED LIKE NOTHING WAS GOING TO HAPPEN. RPTR STATED THAT IF THE ABORT MESSAGE WAS RECEIVED A FEW SECONDS LATER; THEY PROBABLY WOULD HAVE COLLIDED WITH THE OTHER ACFT. THE RPTR INDICATED THAT HE HAD TALKED TO A SUPVR AT THE TWR ABOUT THIS EVENT AND THE LACK OF URGENCY BY THE CTLR TO ABORT HIS FLT. RPTR CLAIMS THAT HE WAS TOLD BY THE SUPVR THAT THE FAA TRAINS THEIR CTLRS NOT TO SHOW ANY EMOTION IN SITS LIKE THIS.