Yea he was going around blowing random people's cars up for no reason (Being a typical try hard) and so I decided to hide in passive mode, wait until he attacked the lower Rank dude, and then I snuck out and destroyed it. I have a video about it here: https://www.youtube.com/watch?v=YFw1znF0viM
Also in GTA Online if you blow someone's Mk II up your bad sport rating will increase AND you will be fined $10,000. But justice is served