I am one of those Flexitarians... and wanted to chime in...
I don't label myself as a vegetarian - But I am labeled one because there's no simple way of labeling my eating repitiore...
I personally don't like to eat beef, pork, chicken, bison, elk, pheasant, quail, rabbit or other meat. I also don't like certain fish. Because they personally remind me of eating people. And I REALLY don't like that. However, I don't have a problem eating tuna fish from a can or canned crab meat. I also don't find gelatin to have any human qualities either. It's just a personal preference.
So when someone offers me a burger and I say - no thanks - They say "Oh are you a vegatarian"... The above ^^^ disseratation seems rather lenthy... when a simple nod or "pretty much" will do.
"If it was easy... Everyone would do it"