Wasps’ chances of advancing to the quarter-finals of the competition now hang by a thread and Hanks was left to rue his side’s abject showing.
Hanks sees his side trailing Pool Six leaders and holders Toulouse by six points after failing to take a bonus point against Glasgow.
Wasps face Toulouse at home next Sunday and Hanks knows it is a tall order to qualify.
He said: “We’ve let down the fans that came up to Glasgow. There’s a good crowd coming to next week’s match, at the minimum we have to respond for them.
“I’ve said to the players that we can’t sit around sulking, we have to front up next week.”
Glasgow’s success came at the end of a testing period where they had an extended visit to Toulouse because of travel difficulties caused by bad weather followed by an away game at Munster.
Glasgow lost narrowly to Munster in a game much influenced by the referee and coach Sean Lineen chose to link those events to his side’s win yesterday.
He said: “It’s been a challenging month and a bit. You can feel sorry for yourself or make something happen – the Glasgow players chose the latter. The players kept the faith and got their reward today.”
Glasgow scorers: Tries: Grant. Pens: Jackson 4. Drop Goals: Jackson.
GLASGOW: Stortoni, Shaw, Aramburu, Murchie, O’Hare, Jackson, Gregor, Grant, Hall, Low, Gray, Kellock, Harley, Wilson, Vernon.
Replacements: Pyrgos for Gregor (78), Welsh for Grant (16), MacArthur for Hall (68), Tkachuk for Low (58), Muldowney for Gray (59), Fusaro for Wilson (77).
Wasps scorers: Tries: Varndell. Cons: Walder. Pens: Walder.
WASPS: van Gisbergen, Varndell, Jacobs, Flutey, Lemi, Walder, Simpson, Payne, Lindsay, Taulafo, Shaw, Cannon, Worsley, Betsen Tchoua, Powell.
Replacements: Haughton for van Gisbergen (70), Berry for Simpson (78), Beech for Payne (60), Broster for Taulafo (51), Birkett for Cannon (51), Mayhew for Betsen Tchoua (66).
Referee: J Jones (RFU).