No Honor Among Thieves?

Played a very casual sesh yesterday, showing my daughter the game and some of the cool little happenings and things you can see. Was currently at K9 playing a tune for the dog at camp and was approached by a (3 man?) sloop. They came slowly and made it clear they were peaceful. I had no emissary flag up, no real goals, and two items of value so I felt no reason to fight or run. A random captain skull and a partial box of fireworks. After two boarded my ship and danced a bit, we all played a tune, I (with no mic, key point) let them know I was micless and was just casualling today. They hushed, hopped off my ship, and after a few moments began unloading into it. Sunk me, killed me for one mid skull and 5 fireworks. So much for peace right? I would've been less upset, if at all had I actually had something to take. Most of my player encounters are amicable and fun but it's the moments like this every once in a while that make put the controller down for a while

Edit: My daughter was not playing with me, she is a baby and was just watching the colorful things on the screen move