"People make mistakes, from football players to everyone in life. Ashley has been faultless this season and has made one mistake.
"There was some booing, but I think there was a reaction as well from people who tried to clap him and were trying to help him get over that."
Striker Jermain Defoe, who scored England's final goal in Saturday's victory over Kazakhstan, said: "Personally speaking I was very surprised at the reaction towards Ashley.
"It was a little bit harsh. He has always played well for England, and I hope the fans can take it back in the next game and just get behind him - because he is a fantastic player.
"Ashley didn't deserve that at all. He is one of the best full-backs in the world."
Emile Heskey admitted defenders are more likely to come in for stick from the fans than forwards.
He said: "If a striker makes a mistake, he has got the chance to put things right and score a goal. If a defender makes an error, it can cost a goal."