Yes, the people of many countries are heavily prejudiced against the Irish. The Irish have had to face down a tough reputation that is hardly deserved. They should be seen as the friendly and fun-loving people they are instead of as alcoholics. While an "alcoholic culture" may exist there, not all Irish people are a part of it.
Yes, other countries are prejudiced against Ireland because they think of the country in stereotypes. Not all Irish people drink, but many countries see them as having that reputation. Even the US was not kind to Irish men and women when they came to the country. We all need to respect each other more.
In the United States we have an abundance of animated television programs with humorous plots. Some examples include The Simpsons, Family Guy and King of the Hill. In all three of these shows there have been jokes about the Irish people and their penchant for alcoholic beverages. These shows are produded for comedic purposes and I don't think they are advocating the oppression of the Irish people on the scale of South Korea rejecting a teacher due to his heritage. None the less a prevailing prejudice about the Irish people is seen in this country.
Teachers teaching and working in foreign coutries should respect their culture and values. Any teacher promoting drinking in or outside the classroom should not be allowed to teach whether in the East or the Western world. Other countries, such as North Korean are not prejudiced against Ireland but the drinking culture instead.