ZAC_DESTROYS_ALL

Ok recently a certain person who i will not mention has came in to my level and copied my stuff. Due to barriers among friends we decided to add each other again...this was clearly a bad idea as he has stolen my f22, strategic_gunner's stuff, and stairway-2-hevin's f16. He never used to copy people's stuff. As of the last month he has claimed many creations and published them into induvisual levels for a short time. My group of friends on lbp has even deleted him exept for some. On top of that he is also extremely racist. He has gotten out of control everyone is starting to hate him! Heck he has even as far as I know sent people to capture my stuff so I can't meet new people without frieght...what should I do about this any ideas? should I contact mm?

p.s. I haven't published my f22 or been on lbp because I am so involved with this conflict