Funny, I got my first "reported" within a couple of hours of launching my first team of dual-boxed mages.
I found civility worked well. He of course started out with a hostile whisper, but I just calmly explained that there's nothing about what I'm doing that's against the rules. Without insulting or belittling him...I mean, admittedly it's obscure and rare enough that you can't expect people to just know it's not illegal. I've seen what..4-5 boxing teams in my two years of playing?
Anyway, I guess since I was civil and just explained, he said, "Just kidding man. So, how do you do it?" 8)