Doesn't change a thing. Doesn't surprise me, either.
Perhaps I'm just jaded, but I've long taken for granted the idea that Chris fucking Barb was well within the realm of possibility, and now that it's happened, my reaction is "HA! That's funny. What's going to happen next?"
This is a man who thinks he's a woman, drinks his own semen, thinks cartoon characters live inside his bedroom walls, and at one point believed he was dating Vanessa Hudgens. He's shoved toys up his ass, ran a Jew over with his car, got himself arrested because Sonic the Hedgehog's arms were the wrong colour, threatened to shoot a man over a Pararapa contest, and made a sex tape with a blowup doll and his own mother's lingerie, in order to convince a pair of lesbians to artificially inseminate themselves with his semen instead of the semen of a dying gay porn star. This is a man who believes himself to be a God. A literal God. Who is in constant commune with one of his children, the psychic hedgehog-Pokemon-monster that he is in a polygamous gay marriage with.
So he fucked his mom? Gross, yes. Funny, yes. Degenerate redneck behavior, most certainly. But I don't see how any Sonichu fan could be surprised. I don't see how this, of all things, is where some longtime watcher of the surrealist trainwreck that is Chris' life will say "Well, Chris was fine before, I could deal with it up till the present, but now he's starting to act crazy!"