I was Dingle a few months ago.
There are a few bars doing craft beer down there now. The most enjoyable two were O'Sullivan's (The Courthouse Bar) and Hannie Agnes's.
O'Sullivan's have their own beer but I would guess that it's not made by them and is, in fact, something else re-branded.
Hannie Agnes's has a decent selection of bottled beer. The only thing letting it down are the amount of children scuttered on cheap vodka and WKD of a Saturday night.
I'm not an old fart either but I think that I raised the average age to about 23... Thankfully they all left (after making a mess) around 10pm.
Foxy John's is a good spot for a pint of Guinness and they have a few things like Gnéas behind the counter.
The Marina Bar had a decent offering of bottles too. The group I was with were very impressed by the whiskey selection in there but I don't drink spirits much at all so I can't comment.