Disgusting behaviour, they should be ashamed.

Yes I was on a business trip that time, but I've also flown Economy via Dublin and it was great, we were once late for our flight and the immigration guy did everything he could to get us on our flight.

Despite this we won't be going again anytime soon.

I think maybe working in Ireland is less stressful for them. One time the lady at immigration told me to come back later as I was too early; she mentioned that the cookies in the lounge were nice, so I brought her a packet when I returned.

Not always, the US immigration guy at Dublin Airport was great last time we went to the US, we nearly always go via Dublin so we can clear immigration there.