As proof this is unprovoked, I have started when I entered the battle (you can ignore general chat, I occasionally post blueprints there):
Above they say they did enough but continue fighting, I’m not sure why. Some russian guy says something I can’t translate
Then (still above), we lost, so I put the sad face. This guy gets super mad at me for it and starts private messaging me.
He continues to insult me, because I’m ignoring the troll.
After these images, he stopped, and I never responded.
I reported him in-game, but I’m not sure why he got mad in the first place. I didn’t do anything wrong other than maybe post the sad face in chat, but I’m not sure why he would be mad at that.