“Buy some corned beef,” my local butcher smiled this morning. “Today, everybody’s Irish.” Well, apparently not everybody. In New York City–home to 2 million Irish-Americans, half as many as in all of Ireland–organizers of the huge Fifth Avenue parade have once again banned Irish-American gay groups from marching. And so the city’s most powerful Irish-American politician, City Council Speaker Christine Quinn, is boycotting the parade. As every Irish person, gay and straight, should. Unless, of course, hatred, exclusion, and obsession with others’ private lives is truly what it means to be Irish. How anti-Irish is being gay? Last year, John…