You really are desperate to defend Pisa, aren't you? How do you know who wrote the headline? That Pisa had it in his story of that date is fact:
"Knox, whose nickname on her Myspace website is 'Foxy Knoxy', originally claimed she stumbled on the crime after a night with her boyfriend. "
You are assuming that the editor wrote the headline. Not necessarily so. Pisa may well have come up with the idea and his editor liked it. What is fact is that Pisa used the term in almost, if not all, of his stories about Knox.
You can't even admit the Pisa is a hack tabloid reporter reduced to working for the SUN now.