Fulham boss Roy Hodgson was disappointed to see England fans boo Chelsea fullback Ashley Cole on Saturday.
"It's a sad situation," he told BBC Radio Five Live's Sportsweek programme.
"It's never occurred in the past and we have to be careful not to glorify the past but it's a bit sad, because players playing for England don't make mistakes deliberately and nobody will have been more upset yesterday than Ashley Cole himself.
"It was very harsh and I don't quite know where that has crept into the English game."