Sean Lineen insisted his side handed Newport Gwent Dragons victory on a plate following their 22-14 defeat at Rodney Parade on Friday evening.
The Glasgow head coach watched on as his men conceded tries to Adam Jones, Luke Charteris and Martyn Thomas.
It is the second successive defeat for the Scottish side in Pool Two of the Heineken Cup and leaves their qualification hopes in tatters.
A last-gasp Dan Parks penalty could have given the visitors a losing bonus point but the Scotland fly-half dragged his attempt wide.
But Lineen admitted he had no complaints after a dismal show at Rodney Parade."We lost the game again and the Dragons didn't win it," he said.
"They scored all three tries from us having the ball. There was a lot of naivety from us and a lack of direction. When we made mistakes, our heads went down and they took full advantage."