Hello Knuthulhu,
My apologies for the wait, I had to get into touch with a Community Manager (.uzi) who generously provided me with the Steam ID of the User you are reporting. I had to do so as you didn't provide valid evidence of Steam ID, which could be acquired easily by doing "status" in the console whilst in-game. The User will be punished shortly for their wrongdoings, thank you for filing this report.
Happy Holidays and all the best!