In prison, rats are considered to be the lowest of the low; right down there with skinners and goofs.
His chances depend on the overall influence of his associates. The ones he doesn’t fink out on.
Either way, he’ll be signing a PC (protective custody) waiver and, because of his notoriety, segregated. To what degree who knows.
The loser is human trash and, in a just and rational world, he would be shot out back the courthouse and pushed into a hole.