How to prove you are friendly?

So me and my brother go into hidden bunker to kill some big arc. We out here trying to get some money. We aren’t in true PvE lobby’s but it’s not the full blown PvP lobby’s. It’s the perfect balance. I go in with a hullcracker and a bobcat for self defense. We get to the bunker, kill some arc, get warned that coming from an antenna, there are some not so friendly people. Perfect, this is what i prepared for. About 3 min later, 3 flairs go up and I have no idea who won, the friendly people or not friendly people, So we go to investigate. Slowly creep over there and my bother gets downed, gives me a live ping and I smoke em, other dude is around the rock, he comes and thrists my bother so I flank em and smoke him too. More people pull up cus at this point like 6 flairs have gone off in like 5 mins. I let them know I’m friendly but I won, I got 10 cells on me, a bobcat and hull cracker, but my friend is dead and so are the PvPers. I go to get my brother’s hullcracker and dip so we can try again and I get smoked cus one of the 6 bodies had a guitar. He punches me dead as his homies is screaming NO NO NO NO NO, gives me no time to talk at all. Insanely frustrating, biggest rollercoaster of emotions from defending the goop but then getting accused of being a rat and given no time to defend myself while down. How do you guys prove you are friendly after defending your stuff?