Infamous Irish people

With McGregor you can laud his sporting accomplishments.

and still dislike his loudmouth, antagonistic, boorish and attention seeking yawnsome schtick.

and the shapes, walking around looking like he just shat himself, wtf is that about ?

His sporting achievements aren't worth much when you realise he's a scummy human being.

MMA is about a half step up from WWE.

Fighters fortunes are all dictated by the whim of Dana White or Paramount Global.

When McGregor took a real fight, he lost. Apart from that, he has no decency. You can be all the successful national sports figure you like, but without decency and humility, its all bullcrap.

Are we? The title says infamous but then the post says...

"Who are some well known and disliked Irish people?"

Niall Horan - the priest who managed to gatecrash a few sporting events.

Burke and Hare

Pair of divileens!!

Lord Haw Haw, William Joyce the son of Irish parents who emigrated to the US was also raised in Ireland but I don’t think he claimed Irish nationality.

After execution and burial in a London prison in 1946 his daughter had him reinterred in Galway in 1976

There was a headline bait and switch by the OP

Colonel Blood... possible crown jewel thief

https://en.m.wikipedia.org/wiki/Thomas_Blood

Leonard Patrick McNally is regarded as one of the most infamous and disreputable traitors in Irish history.

https://en.wikipedia.org/wiki/Leonard_McNally