No, it isn't. I just look at the storm giant racial abilities and note that the standard one has a Strength of 39, and a Dexterity of 14. Given that, there's simply no way that storm giant culture would develop in a way that "flamboyant" would equate to "rapier" - just like in ours, flamboyant has not equated to "pocket knife".
Rapier wielding storm giants are extreme corner cases - and developing rules to deal with extreme coner cases while complicating the majority of situations is, IHO, extraordinarily poor game design - among the various changes made from 3.0 -> 3.5, it was the poorest thought out.