1) Religious feminism is not a core Gospel issue
2) Religious feminism is heretical
Those on the religious feminism side of things often claim what they are promoting is not a core Gospel issue, even though it is vital to be on their side if we are going to reach our culture for Christ. Because they do not always see it as a core Gospel issue, they don't believe they should be shunned for holding it or that there should be any talk of division. They, of course, also deny it is heresy.
Complementarians also deny it is heresy. They also do not believe it is an issue to divide over, at least it is not so divisive they cannot treat feminists as colleagues with whom they may disagree. And since it does not rise to that level, it is not appropriate to call it heresy or divide over it. In fact, both sides of the divide are welcomed on seminary campuses.
But then some feminists now disagree with the first proposition. In fact, promoted on CBEs event's calendar is the meeting this fall of the Atlantic Society for "Biblical" Equality, Side by Side: Men and Women for Biblical Equality