Red pill libertarians are the enemies of Libertarians' enemy, feminism
Laypeople seem to think that antifeminists are their enemy, because they rile up the feminists and cause a big commotion, forcing the laypeople to play white knight at the feminists' demand. Also, laypeople don't necessarily agree with the antifeminists' more extreme stances.
The presence of antifeminists' is perhaps inconvenient in the short run, and the antifeminists' proposals are indeed politically incorrect. Yet, who is the more dangerous enemy of liberty, the feminists or the antifeminists? Antifeminists are the enemy of the common enemy, the feminists, so perhaps should be defended.