Is this a reason male voices should never come out in support of feminist causes and in opposition to misogyny? Of course not. Usually when you see people start to chide others for being "White Knights", though, that is what they are actually talking about. Its not about shaming men for infantilizing women but silencing men who resist hostility towards women.
I've seen this phenomenon a lot where awful behavior is defended by simply labeling opposition to it as "White Knighting". Its an extremely common tactic in fat sexuality forums where treating fat women with respect is regarded as necessarily suspect by far too many. Not surprisingly, it is also common in discussions of feminism where supportive male voices are simply disappeared by dismissing them as "White Knights". Male allies rarely get engaged when they speak out against rape culture or Men's Rights Activists. We, after all, are not the point. The point is putting women in "their place" and confronting other men would just be a distraction. So there will be a quick mention of us as "White Knights" with the implication that this invalidates what we have to say to people can get back hurling threats at insults at women.
Whatever real problems "White Knight Syndrome" might create pale in comparison to the damage it serves as a tool for silencing male voices who speak out against rape culture, sexism, misogyny, and male privilege. Most male feminists aren't speaking out to "rescue" women or curry sexual favor. Most of us speak out because we recognize that men have a stake in this, too. It would be easier for men to retreat to our privilege and let this be someone else's problems but I think its important that we step up and try to be a part of the solution. Misogyny should offend men. Rape culture should horrify men. We have a responsibility to bring our voices into the discussion. Not because women need us, but because it is the right thing to do. "White Knight" accusations are always about protecting male privilege, but this isn't something men are obligated to do. There is NO necessity that we defend male privilege or fall silent in the face of violence and hatred against women. I believe male privilege is unsupportable. Aside from issues of fairness, I would still fight sexism for purely self-interested reasons. Other men treating women poorly damages ALL men and men suffer from the damage a misogynistic culture does to gender relations and our own identities. It limits us and limits our possibilities as men. That it is wrong should always be enough, but I firmly believe it does serve my interests to combat male privilege.
Speaking out doesn't make me feel like a hero. For true "White Knights", this is the problem. They do these things and expect praise. I don't deserve praise for doing what is obvious. Saying that consent should be the cornerstone of my sexual life is a low bar to have cleared. That this may ever feel significant doesn't make me feel pride. It makes me feel the need to keep speaking out. It makes me feel like we should be able to expect more of ourselves. I've gotten used to people calling me a "White Knight" to silence me, but I'm not shutting up. Fact is, this sort of cursory dismissal is far less reprisal than what women face for speaking out. It does cow some men into silence, though, and that's a shame. Men who want to speak out face so few obstacles, but often than minimal impact is enough to convince some men to just retreat to the sidelines. To any man intimidated by "White Knight" accusations into being silent in the face of hatred, I urge you to take inspiration from the women who are speaking out. Male privilege affords us the unwanted benefit of facing far less hostility when we raise our voices against those systems of privilege. Its not fair to let what little we do face keep us from take responsibility for our own lives and our voice.