I don't think Chris related to Sonichu to begin with.
Everyone has always treated Sonichu as a self insert, but I think that's a mistaken assumption.
Sonichu was designed to be Chris' idea of a perfect best friend, not his avatar of himself. Autists have trouble putting themselves into other people's shoes. Chris doesn't want to imagine himself as Sonichu. That would be an absurdity to him. The only person capable of being Chris is Chris himself. Duhhh! (Chris would think, and in all probability, say aloud to your face.)
So I don't think Chris thinks of himself as either Sonichu or Rosechu.
I think Chris would dog on Sonichu for being a stereotypical brute male nowadays, but I don't think it'd be malicious. I think Chris probably typecasts Sonichu as his dopey sidekick comedy relief. Or as the dumb sitcom dad with the hot wife, also a comedy relief thing. Think Married with Children.