If I had a gripe about too much noise eminating from the forward galley I would say to the crew "Excuse me, but there's too much noise and I can't sleep - could you please keep it down?". I've done it once before when travelling FCL on a CX A340 and the crew were mortified that I had to make the request. While there's no excuse for the disregard of FCL passenger comfort, if the crew don't know there's a problem then how can they rectify it?