Rare said
Cosmic, could we be hostile? You could say that my nation shot at your exploration ship, thinking it was a pirate ship. My nation will always say that it was a mistake while you could say it wasn't and hate us. So you decided to be friendly with Aristo's nations instead of my nation.
Frankly, it would take more than a single Ralgon exploration ship being "randomly" attacked for supposedly being pirates. If they constantly attacked Ralgon ships though, then they would hate them -- but that would mean that the Ralgons would try to expel your faction out of the eastern seas, along with any legitimate pirates. On the other hand, if you end up hitting a Navy ship, the Ralgons would interpret it as an act of war, and then relations would rapidly go downhill.
Truth be told, the Ralgon explorers have little to do with the Ralgon government itself, even if they typically find favor with it if they come back with something good. It will take explorers repeatedly coming back with news of being attacked for the Emperor to send the Navy off to retaliate.
By the way, does your nation already have an existing grudge against Aristo's?
And is there a particular reason you wish your nation to have hostile relations with mine?
EDIT: One last thing, is your nation heavy on its navy, or its land force? The Ralgons wage naval battles primarily, and rarely venture far onto their opponent's land, instead being content to harass the coastlines during a conflict.