Epic Irish Lady Ethers Conor McGregor, 'Disgusting Man, Absolute Disgrace'

If you think Conor McGregor's bus attack pissed people off in New York, wait 'til ya get a load of this old lady from Ireland ... who went NUCLEAR on Conor at LAX!!

THIS CLIP IS HILARIOUS!!!

Our photog was asking Brandon T. Jackson a question about McGregor when this woman came outta nowhere, hijacked the interview and unleashed hell on the Irishman.

"Absolutely disgusting man. Nobody likes him in Ireland," she told TMZ Sports.

She continued -- "Absolute disgrace. And if Mayweather ever sees him again, I hope he kicks his ass!"

There's a lot more .... and Brandon loves it!

"You about to get a whoopin' by grandmama right here ... I got my money on her, Conor," the "Tropic Thunder" star said.

Yeah ... might wanna look into extending that vacay.