There is equality and there is equity. Libertarians are for equality even if it creates non-equity.

Let me give an abstract example so that it is not politically charged. Suppose that there are green-skinned people in our society that for some historical reason value writing poetry above all else. And they are trying to earn their living by writing poetry and sometimes having second part time usually low paid job to support themselves.

Libertarian would say that these green people has absolute right to do so, and face consequences of their choice. This is liberty.
People who advocate equality would say - no, there is systemic green-ism that leads to green people being consistently underpaid, having less percent of them in high level jobs like CEO, and so on. They then propose all sorts of laws that will treat green people differently so that the average salary, average number of CEOs per 100,000 population and other similar metrics associated with “success” are the same for green people. This kind of differential treatment of green people is absolutely against to liberty minded people, that includes libertarians, that think that the laws should be the same to all people, regardless of their skin color, genetics and so on.