The Black Cats were held to a 1-1 draw by Norwich on Sunday, despite playing against 10 men for over an hour.
"You always get that, being judged [by fans and pundits] is a part of football," Johnson told BBC Newcastle.
"If it's going well you're the worlds best, when it's not you're the worst."
Johnson added: "I never read papers when I was younger, it doesn't bother me anymore what people say about me, I just want to get on with the game and do as well as I can.
"As a team and as a club we've got to stick together and just get through this bad time, all teams go through it."
"When you're winning it goes well, no one has anything to moan about," the 25 year old former Manchester city player added.
"When things aren't going well, people get down, the team and fans and the sooner we get a couple of good results the better. We've just got to keep fighting."