There is no passive meaningful interaction. I've actually stopped saying 'o7' and started enthusiastically saying 'Heya!' or 'Hi, everyone!!' just so I'll get a response, even if it's 'what the heck'
I go much further, posting detailed warning about how I'll destroy their ships if they don't comply & various other Zarek propaganda to docked ships, etc.
When ganking I always send at least one and usually three comms before I attack. And just in case there is a language barrier I always make the final comms very very simple such as "HALT OR I FIRE" or even just "STOP".
Maybe 1/10 pilots reply. Even after I've beat them up to low hull and stop firing to try comms one last time.
I really wonder why some people bother playing in Open at all. I realize I'm not everyone's favorite interaction, but if you're going to just act as if comms don't exist why not just play solo? Maybe some new players don't realize comms are a thing but I find it's pretty common even outside noob areas.