Re: Why isn't any one offended men were required to wear a blazer and slacks or suit?
Simple answer - a man making the equivalent complaint would just be laughed at and ignored (see my story elsewhere on this page). And never taken seriously thereafter. I'd just treat that dress code as an excuse to stay away from the event.
A woman can complain and get taken seriously (as this story demonstrates). This is a Good Thing, and will no doubt eventually extend to men. It's just a shame it didn't all happen long ago.