Linguistics

When you speak to a co-worker in front me in a foreign language, I immediately assume it is some derision at my expense. Since I allot the normal amount of disdain towards you based on this assumption, you may as well speak plainly. And for me, it isn't a stretch to dislike and distrust you based on just being someone I don't know, but for the general public, muttering and sneering in your native tongue is not the best method to create goodwill.