From my understanding your friends had guns aimed at the cops and they didn't immediately shoot you and instead gave ample opportunity for you to leave, but you attempted to (as a vortigaunt who has killed dozens of cops) engage in casual conversation as your fellow rebels aim their guns at the cops.
Obviously that team is going to call back-up when they are out numbered and a vortigaunt is there. You can't expect cops to just talk to you casually as a vortigaunt, especially when you have a bunch of other people with you aiming guns.
There's a lot to unpack about what happened, so I'll try my best to parse how it all happened from my point of view.
-Me and three rebels partake in what looks like a minievent
-APC drives right past us without incident, making me think maybe every encounter doesn't have to lead to a shootout
-Small cop patrol appears, standoff begins (obviously, both sides are too far to yell at each other and it's kinda even numbers)
-Minievent guy tries to mediate and I keep getting my hopes up
-I think to myself
"Maybe we can move along from each other without an incident."
-Your abundant backup comes over
-Rebels behind me run off while I'm confused as fuck (though I did tell them to do that while trynna process what's going on)
-Decide to make an /itl to signal I'm running so nobody can complain I ran off without RP
-Dead from s2k
Lesson learned I guess.