POTENTIAL CONFLICT SENSED BY TCASII TA THEN RA. PIC LOSES HIS 'COOL.'

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THE CAPT INSTRUCTED ME TO LEVEL OFF AT 2000 FT. OUR HDG WAS 130 DEGS ASSIGNED BY TWR. THE LEVELOFF WAS FOR TFC HE SAW ON TCASII. SHORTLY AFTER THAT WE GOT AN RA INSTRUCTING US TO DO THE SAME. THE TFC WAS NEVER POINTED OUT TO US BY TWR OR DEP. AFTER THE TFC WAS CLR WE CLBED TO 3000 FT; THE CAPT GOT MAD AND STARTED TALKING TO DEP ABOUT THE TFC. DEP APOLOGIZED FOR MDW TWR AND SAID THIS HAS BEEN HAPPENING A LOT THERE. HE MADE MANY UNUSUAL COMMENTS ABOUT THE POOR PERFORMANCE OF MDW OF LATE. THE CAPT GOT MADDER AND SAID HE WAS OFF TO TALK TO MDW TWR; BUT HE SWITCHED THE #1 RADIO TO TWR LEAVING DEP WITHOUT PERMISSION. FOR A TIME I THOUGHT HE WAS TALKING TO TWR ON #2. MDW TWR SAID THE VFR TFC HAD US IN SIGHT. THE CAPT GOT MADDER; THEN HE SAID HE WAS BACK ON; THEN A FEW SECONDS LATER HE SAID HE WAS OFF AGAIN TO TALK TO COMPANY. THIS TIME HE DID USE THE #2 RADIO TO COMPLAIN TO THEM. WHEN HE DID THIS HE DIDN'T SWITCH BACK TO DEP ON #1. I DIDN'T REALIZE THIS UNTIL TWR CALLED TO TELL US TO SWITCH BACK TO DEP. THE CAPT'S ACTIONS DURING THIS INCIDENT WERE DEPLORABLE. CONFLICTING TFC SHOULD SEE EACH OTHER OR BE PROVIDED WITH SEPARATION BY ATC. AS ACR PLTS WE ARE RESPONSIBLE FOR MANY LIVES AND IT IS WRONG FOR THE FAA TO PROVIDE VISUAL SEPARATION BASED ON ONLY 1 ACFT SEEING THE OTHER. WHAT IF IT WERE A STUDENT PLT OR A PLT WITH VERY LITTLE EXPERIENCE WHO DID NOT KNOW HOW TO GET OUT OF OUR WAY?