The defeat left the Warriors - who face the Dragons at Firhill on Friday - second from bottom in the Magners League.
Sean told BBC Scotland: "There was a bit of laying down the law. We had the meeting not because of the defeat but because of the manner of it.
"The players, though, admit it's not good enough and want to put things right on Friday.
"They haven't become bad players, just like we haven't become bad coaching staff.
"If you look at it, we've been without 17 players because they are injured or on international duty.
"When you look at Connacht, I don't think they had anyone on international duty. February is always a difficult time for us."