I don't really understand what you're saying. What stops you, as a solo player, from doing Strikes, Gambit, Crucible, Dares of Eternity, weekly Campaign missions etc? It would be astonishing if you had [i]any[/i] interactions with other players in those activities, never mind toxic ones. Raids and Dungeons are the most effective way to gain Commendations, but are by no meals the only way. As for the ranks themselves, it is common sense that the higher ranks are only for players who do everything in the game. If you're placing limitations on yourself that prevent you from going up a rank, that's on you.