Through looking at various definitions of xenophobia, many of the definitions describe it as an abnormal or intense fear of foreigners and/or outside cultures and materials. But one definition gives a good example the way someone may act when xenophobic. It is from http://www.phobiaq.com/phobia/xenophobia240.html
Fear of strangers or foreigners
Information on Xenophobia
Xenophobia is the irrational fear of strangers and foreigners. In order for a person to exhibit xenophobic behavior, he must genuinely believe the target is a real threat. For this reason, xenophobia and racism are two very separate concepts. Xenophobia can be aimed towards entire population groups within a society as well as individuals. Immigrants and recent settlers are equally targeted. Cultural differences are perceived as dangerous. Hostility, anger and violet reactions are common symptoms of xenophobia. Other symptoms include anxiety,sweating, increased heart rate, increased rate of breathing and avoidance of public or social situations. Xenophobia can keep apart loved ones and business associates and have a major impact on the quality of life. Serious consequences such as political campaigns for linguistic purification, isolationism and genocide can occur if the phobia goes unchecked. Causes of xenophobia may include a traumatic experience sometimes in life that provoked a panic attack near a stranger or foreigner. This behavioral response then became encoded in the body as a natural reaction to the stimulus.
Although this phobia is believed to be learned, it can be unlearned through cognitive behavioral therapy coupled with anxiety medication. It is best to try proven treatments before wandering into the forever growing pool of unproven ones. As always, therapy forces the patient to confront his fears and reassess the rationality pathways in his brain. It is imperative to embark on this treatment with an open mind. Although medications can speed up the process, they include serious side effects and are never a permanent solution.
It seems to me that though there may have been individuals or minority groups of D'ni that may have had xenophobic tendencies it wasn't common in the majority, many times has it been said in the Palace books that outsiders had a great influence in D'ni culture and in one point in time 2 Kings were even married to outsiders. But the groups that tried to stop outside involvement in D'ni like the Blood of Yahvo or The Judges could be percieved as highly xenophobic; they seems to fit the definition, though it could also be a different symptom of civil unrest or as many have done on Surface societies use outsiders as scapegoats for their own societal ills. There may have been xenophobic members, but the leaders may have had other ideas and desires other than just to end outsider involvement. Religion comes to mind and the idea of taygehn (sp?) that the leaders of D'ni use it instead of what these groups believed one should act and follow.