Not had this happen to me, yet! Did you confirm that the booking took place? I didn't think you could receive back unless you had confirmed this...? You could message AW and explain the situation and ask them to remove the feedback but I don't have experience of this so hopefully somebody else will step forward and confirm whether this is worth a go or not.
If you can't have the FB removed then you are able to respond and give your side of the story and if it come's to this I would make it very clear that the guy had been pushing for BB etc etc and the guys who see this will realise why you wouldn't meet him.
Yes I'm sure it's annoying to have a negative FB, but if you have heaps of others confirming how brilliant you are then I wouldn't let it worry you, one piece of bad FB isn't going to deter the punters IMO.