Is it possible for someone not in a position of authority to practice unrighteous dominion?
I say ‘yes.’ In a modern world, you can exercise your rights and your prerogatives in a way that is tantamount to unrighteous dominion. Rights are powers. To have a right that others are legally, practically, or morally bound to recognize is to have some authority over them in practical terms, whether we think of it as authority or not. Democracy and equality don’t abolish authority. They distribute it.
Note: I think this only applies to rights that one can choose to waive.