Besides this silly Miku thing, there is something about him seeming saying something about "No Freeing Palestine." I can't say if he was really being terrible or if it was a bad joke he didn't realize how bad it sounded, seeing he deleted it after 'shrug'.
There is something about about him him knowing an artist (Wandaboy) who lures other artist into having E-Sex with em. Not much is said on that except that Ninjamuffin did try to apologize to the victims for his behavior. I can't say I know much about what was going on there...