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The Hoops annihilated their opponents at Parkhead with the league leaders going 5-1 in front before the break. Kieran Tierney, Callum Osmand, Benjamin Nygren and a Jamie McCart own goal destroyed the Jambos.
After the restart Camilo Duran and then Nygren again found the net to round off the result and Vrancken was dejected at full-time as he analysed his side's performance.
Defensively they were shambolic at times and the Belgian coach acknowledged that Celts found it simple to carve open their foes at will.
"Did we make it too easy? Yeah because after the two corners, and you see the goals back, it's not difficult to miss the mistakes we made and we were totally exposed in these moments," he told Sky Sports.
"This is where we didn't want to be and then Celtic have the quality to finish them off.
"When you give them this space."