BUFFALO – Getting fired by the Jets did nothing to humble Rex Ryan.

The coach was his old, brash self in his introductory press conference as the Bills head coach on Tuesday.

Ryan promised the Bills will end their 15-year playoff drought, have the best defense in football and challenge the Patriots for the AFC East crown. He’s baaaaack.

“I know it’s been 15 years since the Bills made the playoffs, but get ready,” Ryan said. “We’re going. We are going. Am I going to guarantee a Super Bowl and all that? I’ll tell you what I will do. I will guarantee the pursuit of it. There is no question about that.”

The press conference was a love-fest as the city is thrilled to have the colorful Ryan replacing Doug Marrone, who opted out of his contract on Dec. 31. The press conference was attended by everyone from the Buffalo mayor to Bills legends Jim Kelly and Thurman Thomas.

Ryan did not talk directly about his six seasons with the Jets, but he bristled when asked about his recent record leading people to conclude he is a mediocre coach. Ryan went 4-12 in his final year and the team missed the playoffs for four straight seasons under him.

“I think they realize that I’m not a mediocre coach,” Ryan said of Bills fans. “The record that may say that, especially this year. You mentioned we had two 8-8s and a couple of losing seasons, lousy seasons or whatever. But they understand the game a lot better than you give them credit for apparently because I’m not a mediocre coach, and anybody that thinks so I would challenge them with that.”

The Jets fired Ryan on Dec. 29, the day after the season, along with GM John Idzik. Ryan interviewed for the head coaching openings with the Falcons and 49ers, and it has been reported he preferred those teams to the Bills, where he ultimately ended up. Ryan said that was false. Ryan said he was blown away during his interview with Bills owners Terry and Kim Pegula along with team president Russ Brandon and general manager Doug Whaley.

“This is the place that I wanted to be,” Ryan said. “I was just thankful that they felt the same way.”

Ryan, 52, said he believes this is his last chance to be successful as an NFL head coach.

“I have one more shot to be a head coach, and I have to get it done,” Ryan said. “I understand I won’t have another opportunity and don’t want another opportunity. This is the shot that I want.”

Ryan acknowledged staying in the AFC East makes the job a little sweeter, but said he is still focused on beating Bill Belichick and Tom Brady, not his former employers in Florham Park.

“I’ll be honest, I think it’s still the Patriots I want the most,” he said.

As for getting fired by the Jets, Ryan said he has a chip on his shoulder.

“It’s the first time I’ve ever been fired,” Ryan said. “I’ve been fired as part of a staff that got fired. When it’s my name that leads that list, that heads that list, yeah, it’s personal. There’s no question about it. It’s embarrassing because I see myself as a good football coach. Hey, I can’t wait.”

Terry Pegula, who bought the Bills in October, said he wanted an experienced coach to lead his team, which finished 9-7 in 2014.

Marrone abruptly left the team three days after the regular season and was thought to be a favorite to land the Jets job for a short time. Ryan took a not-so-subtle dig at Marrone, something that went over big with the Buffalo crowd.

“This is the most loyal fan base in the National Football League and we recognize that,” he said. “This fan base, the loyalty they show to this football team, they deserve a loyal coach.”

Ryan inherits a team that has a strong defense but question marks on offense, most notably at quarterback. It is the same scenario he faced with the Jets. He was asked several times about EJ Manuel and the Bills’ quarterback situation, but ducked most of the questions. He did acknowledge they would consider former Jet Mark Sanchez, who will be a free agent.

“I know what wins in this league,” he said. “Do I have to get better in certain areas? There’s no question about it. Do I need to do a better job of maybe building a quarterback and all that sort of stuff? Sure, certainly.”