It's a bizarre thing and only something thats maybe become really apparent in the last 10 years with so much social media and forums like this.
But my impression is Dubliners seem to really have a chip on their shoulder when it comes to anyone from any of the other 31 counties.
- They seem to dislike the national games because they're played more successfully elsewhere.
- Seem to have a genuine dislike of customs, accents and locations everywhere else in the country. I remember one Dublin guy on that TV3 show take me out saying he was hoping for a Dublin girl as he "dislikes the culchie accent". I was unaware all 31 counties and 5 million people shared the same dialect.

- Seem to dislike Irish made programs that aren't made in Dublin or programs in the Irish language, generally it seems to be more acceptable to watch British programming there than say something rural based like Kilnaskully.
I find it quite sad that a lot of people there don't seem to be able to have pride in their city or county and have to snipe through arrogance and igorance at everyone else hiding their own insecurities about where they live, not even at particular areas. Dublin people tend to regard the country as two zones "Dublin" and "the country" which is quite funny, I don't know anywhere else or any other country which would have people so narrow minded as that.
The fact that dublin has the highest emmigration rate in the country is probably testament to how much love its people has for it.
There's a lot of awesome things about Dublin IMO, it isn't warranted.