Nope, but it reminds me of hacking accusations. Big one that stands out was some guy on my regular TF2 server. He was so obviously aim-botting but his "buddies" were always defending him because he was a regular and would always deny it. Didn't matter that the guy was sniping headshot after headshot despite people jumping, crouching, strafing, or just clearing a corner. Big group, explosions everywhere, people in the middle of hopping fighting someone else, he'd headshot them. After I stopped playing, I visited the server's forum and there was a huge announcement about that guy being banned for hacking. Everyone was "OMFG, can't believe it".
I only play co-op now if I'm online, which is rarely.