I’m not a fan of that term, because it suggests that people who have a problem with Whedon’s feminism shouldn’t talk about it or act on it. If we project that back and outwards we wouldn’t have the important work done to intersect between the original feminism - which was very much a middle class white issue, and the issues that ethnic minorities and the LGBT community face. Especially that last part because there are still prominent feminists today who actively discriminate against trans women. If it weren’t for Third Wave feminists standing up against the pillars of the Second Wave, we wouldn’t have anywhere near the level of trans acceptance we have today, such as it is.
Now, that’s not to say that the left’s biggest problem isn’t solidarity, there’s truth to that bit in Life of Brian, of course. What we need to do is to present a unified front to the Right and (especially) the Centre, but never stop looking at ways to improve our own views and discourse.