In southeast America, there do seem to be quite a bit of "chubby chasers". These tend to be slim white redneck or white trash types, or just black guys with a huge ass fixation. They tend to be lower class poor people for the most part, but they do exist.
There are even trailer park women versions of these chubby chasers, but there's no way they'd not be instantly turned off by Jimbo's pedophile rants.
Once again, he doesn't realize that he's alone because he's an utterly disgusting pedophile autistic half-person, rather than just being "fat shamed" (though his weight issues certainly don't help).