Don't be so harsh on yourself..it just so happened by God's will that you met a few people of x nationality who you dislike for hopefully justifiable reasons. I'm sure you must have felt dislike towards people of other nationalities including your own too somewhere in your life,yes? Just know that there are good and bad people everywhere and just cos you've met more of the "bad" from one set don't mistreat all of the people you meet from among them due to the misdeeds of some. My two cents!