No, he's a flirt/potential cheat.
And is trying to gas light you that it's a cultural thing. It's a him thing.
Most Irish men I know don't act like him .... Unless they're big flirts and cheaters.
Drinking wise ... We have a dysfunctional culture re. drinking; but I don't think it's much worse than the general UK & Ireland dysfunctional culture.
(Or Eastern Europe for that matter, having had a Polish ex, lots of Polish acquaintances and a Slovakian acquaintance. Or lots of regions).
Back on the 'it's an Irish thing" I met a girl from my hometown (Derry/Londonderry) who was a violent, volatile alcoholic. I don't mean that lightly - she's start fights and once caused a house fire drunk that she only escaped because a house mate pulled her out of it.
She repeatedly said "it's a Derry thing" ... It is not a Derry thing to be a violent alcoholic. Derry people, like everyone, are a wide range of people.
She clearly uses the same brand of BS that he does. If say she has a personality disorder, maybe he does too.