"Since 1920, the vast increase in welfare beneficiaries and the extension of the franchise to women — two constituencies that are notoriously tough for libertarians — have rendered the notion of “capitalist democracy” into an oxymoron."

So not that giving the women the vote was a bad thing, just an observation on how women vote.

In follow up comments he said:

"It would be absurd to suggest that women’s votes will be taken away or that this would solve the political problems that vex us. While I don’t think any class of people should be disenfranchised, I have little hope that voting will make things better."

In other words, voting isn't enough to bring about needed change (look at the U.S. over the last 2 decades for evidence of this)