crowded pools

I hear ya. The lanes at my college pool are clearly marked SLOW MEDIUM and FAST. I ususally always go in the fast lane, because I am swimming continously with flip turns. Im usually in the lane with a bunch of college swimmers doing makeup practice laps, and I can keep up with their pace. But sometimes I get some jackass who thinks he is "All that" and cant swim to save him who wont let me pass him (they swim in the middle of the lane rather than keep to the right) and crowds the ends so I cant do flip turns. I usually kindly remind them to keep the ends clear and let the faster people pass, but once the guy went off on me saying it was a "Public Pool and I will swim howerver dammed slow I want". Im usually coruteous in the pool but some people have no sense of ettiqute.