simply Khmer

A foreigner AIMed and asked me:

(guy) Hello
(me) Hello sir
(guy) Where are you from?
(me) Kampuchea
(guy) Cambodia?
(me) yes
(guy) Are you Khmer rouge?
(me) No sir, I am Khmer
(guy) Not rouge?
(me) Simply KHMER. Rouge is not Khmer, it's a foreign word.
(guy) My apology.