A Harp on the make, or worse yet having made it is a terrible thing to behold. Arrogant, stubborn, exclusive, and eager to rewrite their past. Tend to be found in business and politics, although the political version has a strongly "unsnobby" element as well.
I take some small issue with the good Dr. Entropy's review. He is correct in saying that its a contradiction in terms, and it does tend to the result of their being relatively few Irish snobs, but they more than make up for it with their diligence to snobbery. The phrase "lace curtain Irish" wasn't invented for nothing.