Every social, cultural and legal change in American society in the last 50 years (or more) has been at the expense of and to the detriment of Straight White Males.
PS. I can come up with one piece of evidence to the contrary, at least initially. The Sexual Revolution allowed Straight White Men to have more sex because White women were more willing. Whether this has turned out to actually benefit SWM's --because the Sexual Revolution became quickly entwined with Feminism-- is debatable.