Jason, who plays hardman Dano, also admitted he has never watched a single episode of the drama which has pulled in audiences of over 1m.
The Dublin star said he hasn’t experienced this type of fame since he appeared in blockbuster Titanic in 1998.
“I hadn’t experienced it,” said Jason. “I flew in this weekend and went for a birthday drink with my mum and dad and brother to the local pub.
“I walked in and literally within about 20 minutes there were hordes of people wanting photographs and all sorts of stuff.
“Within that hour and a half I was there, I really felt the power the show has had in the last six weeks. It was phenomenal.”
And he said actor Tom Vaughan-Lawlor, who plays Nidge in the series, has also missed out on Love/Hate mania, as he lives in London.
“I talk to Tom a lot and he lives in England and he is aware of what is going on so but I’d say it would be interesting for him to walk down the street.”
Jason said the show’s violent nature meant the cast constantly thought they were going to killed off.
“Things don’t look good for anybody on the show. When you read the script as an actor, every page you turn you feel like you are getting closer to death.”
He said he was hugely proud of the gritty series.
“The talent has always been there in this country for this happen. The combination of people have put together something very special and something that this country has been crying out for, for a long time and something we should be very, very proud of.”
Jason is barely recognisable from his Titanic role as Leonardo Di Caprio’s Irish pal Tommy Ryan, but puts his dramatic physical transformation down to his new passion for running.