In order for multiculturalism to have worked for so long, the regressives have relied upon being ignorant to the extreme differences of each culture they wish to include. Anyone who dares to point out the incompatibility simply gets put into the same box of things that they choose to ignore about those different cultures, and in doing so, they make those groups untouchable.
The brilliance of Islam Is Right About Women is not specifically that it focuses on Islam and women, but because it pits two untouchable groups against one-another. Even if they try to redirect the conflict at the person who put up the sign, cracks are still formed within the idea that the two untouchable groups are really compatible. The same format can be used for any other untouchable groups.