I hate to get so semantical but using the word pedophile incorrectly just desensitizes the word. Pedophilia means being attracted to children, primarily meaning before or in the early stages of puberty, usually younger than 13. In fact, many pedophiles would not be attracted to someone aged 15+ because they are typically exclusively or primarily interested in prepubescent bodies.
That doesn't mean this guy isn't a total asshole, but he's not a pedophile, and I think anyone can understand an adult sexting an older teen, while still absolutely horrid, is quite different from sexting a child.
Once again, absolutely not defending this guy, I don't even know who he is... but I think it's important not to desensitize the word.