Simply put: Hellen is the general term for Greek, Macedonians, Epeirotes and others are just as Greek as anyone among the "Southerners" (just read Herodotos, he claims that there are quite a few Phoenician/ Egyptian influences, especially in the south...). Next: because of it's general meaning, Hellen is used to either note "we Greeks vs. those barbarians" or "we vs. the other Greeks". The latter, of course is the case with the misellen trait and Greek character combination. The person doesn't like all those others calling themselves Greeks and considering him barbarian. "What?! They would call my kin barbarians, when in fact we did all their dirty work?! And to think they dare to stand against us! Buggers!"