It's exactly the opposite. JustSid does not criticize the things Realspawn did. He criticizes the things Realspawn did NOT do but claims to have done.

I don't know if Realspawn has used copyrighted material, but if that is the case I think JustSid or anybody else is absolutely right about critcizing that. Using copyrighted material should lead to exclusion from a contest, especially as the winning entry cannot be published then. I also don't think that it's rude or offensive to clearly express this. A copyright infringement is no peccadillo.