It's obviously the fault of the person he was shouting at.

Nowhere to run, nowhere to hide.

Aww, Shucks. Do you suppose his E.U. passport still works?

The keeper has a right to be upset.

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Law 12 (Fouls and Misconduct) includes the words “prevents the goalkeeper from releasing the ball from his hands” as an offense punishable by an indirect free kick. By tradition and interpretation, this violation is described more generally as any action by a player which interferes with the opposing goalkeeper’s ability to get the ball back into active play freely and quickly.

A goalkeeper is considered to be in the process of “releasing the ball” from the first moment when he or she has clearly taken hand control of the ball until the moment when the ball has been clearly released into play. This includes any time when the goalkeeper is:
•bouncing the ball,
•running with the ball
•in the process of dropping the ball in preparation for kicking it
•throwing the ball

During the time the goalkeeper has control of the ball and is preparing to release it into active play, an opponent may not stand or move so close as to restrict the direction or distance of the goalkeeper’s release.
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So, not so much a keeper blunder, but an obviously bad decision by the referee to NOT call a foul on the player who clearly and intentionally placed himeself to interfere with the goalkeeper's distribution.