The R’s battle manfully with only ten players after Bobby Zamora was sent off in the 21st minute before Loic Remy put them ahead with five minutes left at Loftus Road.
However, Shaun Maloney nicked a point for the Latics with a 94th minute equaliser which kept the R’s seven points behind Sunderland and Wigan, who sit 17th and 18th respectively, and gave Redknapp that sinking feeling.
"We had worked so hard with ten men all game and I felt we deserved a goal. It was a fantastic goal and then we gave two silly free-kicks away on the edge of the box and the second one allowed them to score with the last kick of the game,” he told Sky Sports.
"It couldn't have been more cruel. We didn't deserve that. We deserved to win today with ten men.
"The players were fantastic. Every one of them worked their socks off and you can't ask for more than that. The ability they played with was absolutely top class."
Redknapp added: "We have shown spirit every week since I've been here. You can't ask for more. The players I've brought in have done great. Remy's scored goals, Andros Townsend was magnificent today, Jermaine Jenas worked his socks off in the middle of the park and Chris Samba put in a performance.
"We are a much improved team, but unfortunately it is hard when you are playing catch-up all year.
"We have got to keep believing but you need a bit of luck sometimes and we didn't get any today.”