We can think of any force, sufficiently empowered, as the graveyard of all social relations. Now we're exiting capitalist critique and entering the way of all totality of power.
It's very important to be able to "exit capitalist critique and enter the way of all totality of power"; or, rather, to pursue capitalist critique while under its wing. In a word, this is anarchism: Capital is one manifestation of an unequal distribution of power. It's not the only example, or the most important example in every case.
Every relationship contains some internal distribution of power which must be legitimated by its participants if social liberty is to exist. There are as many opportunities for abuse of power as there are types of relationships. Usually, people focus on whatever questions of authority arise out of the relationships they are in.
Because I experience the capital-relation as a form of subordination and patriarchy as a mode of power most directly (i.e. input from other relations, like race and sexuality are less constant), I emphasize them. Given time constraints and other real world obligations, any stance "against all authority" will inevitably become an examination of particular authorities at the individual level. What we learn from others is what they know best from their own experiences. We are, each of us, called to listen and to teach.
Thanks to almostinfamous