Xenophobia is literally a "fear of unkown". What I meant to say is that one could rationalize irrational fear of unknown speech with this feeling of exclusion, but could it be it's just uncommon sounds and intonations that make you feel uncomfortable? I've mentioned Italian sales for this very reason: facing a different culture would naturally raise questions within you: - are they talking shit behind my back? - do they have something against me? this all depends on your levels of paranoia and xenophobia. As a person coming from a vastly monocultural society I used to feel this, too. I believe the solution to this is being open for everyone and overcoming xenophobic sentiments and by no means complaining to the boss.