no wonder you are p'eed off!!
but TUT TUT, schoolgirl error kandi!! shoulda known better than to leave the conversation with your OH without CLEAR AND SPECIFIC INSTRUCTIONS as to how your OH would approach this with his mate! 
men have no idea about tact and diplomacy in these delicate situations!! tell your friend that the best thing she can do, if she really really doesnt want him to go to this place is to make it HIS idea not to go! in my experience you plant little seeds, you make off the cuff comments and remarks to get his wee mind thinking, and low and behold he changes his mind...... so she either drops hints about going somewhere else (where he would have a MUCH better time) or she drops hints about how rubbish the place is that he has decided to go!
GOOD LUCK!
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(¸.•´ (¸.•` ¤ Tied the knot 10th July 2010