Being a guy, I'd laugh at the fairy
If I was a woman, I'd give him a show that only he could see with his goggles. If he's that desperate for apeak, he deserves some special attention... besides, if he tells someone about it... who's going to believe him... he'll look like a complete idiot.
As a Scuba Instructor I must say that we often train in pools beneath swimmers. A woman with a gorgeous swimmers body is hard to ignore. An occassional peak is to be expected... staring is plain old bad manners. You swimmers are often a major distraction to my students... I'm trying to teach life saving skills and you girls are distracting my students with your thong and speedo bathing suits...
If it really bothers you, perhaps you should wait until the divers get out of the pool before you go for a swim. If this is an idiot freak, not part of a class that just wears goggles to the pool for a thrill, I'd either give him the aforementioned show... if I was an exhibitionist... or if not, I'd report him to pool management... the 14 year old $7 an hour Lifeguard probably wouldn't know what to do or would be embarrassed by the whole thing...
Good Luck