Panhellenic History and GDIs!

[AlexMack]

I've come across a new hurdle recently. I can defend against people saying sororities are terrible, we're all vapid airheads who buy our friends. What I can't really defend right off the bat is why we're 'greek'. I had someone get up in my face about how using the greek alphabet doesn't make us greek and because we're not up-to-date on greek culture, we're hardly greek and shouldn't call ourselves such.

So, history, defense? Why do we call ourselves greek and how do you defend it?