More likely, some of the millions of people in Starfleet are and some people aren't. Some of the thousands of cultures in the Federation will be and some won't. And it won't be all or nothing, a sliding scale between the two extremes. Sexism, racism, specism, shapism (according to Data this one is still there), others. Just because a world or group of worlds joins the Federation doesn't mean everything about them get re-ordered. What they are becomes part of the Federation.