As a result, they are still battling relegation and are only out of the drop zone on goal difference at present.
Asked about boos after their 1-1 draw with Crystal Palace at home on Monday, Garner replied: I can understand the fans' frustrations.
But there is so long to go (in the season), and we need the fans to be supporting us and not booing us. That is important going forward."
We knew it wasn't going to be an easy game, but I feel like it is one that has definitely got away from us," he added.
"It was a very frustrating night.
They are a good side and I'm not sure whether we were off the pace, but we did create a few chances and didn't manage to put them away.
The last 20 minutes was a lot better and something that we need to build on and look to be doing for the whole 90 minutes."