MIAMI — The man who dared opponents to “come get” the Mets this season offered his concession speech Friday.

“They came and got us,” general manager Brodie Van Wagenen said, when asked if he was overzealous in his offseason pronouncement the Mets were the team to beat in the NL East.

“I think now we view ourselves as the underdogs. For the second half of this year I think we have low expectations for what we can be and I think now we’ll take the underdog role and run with it and try to prove some people wrong this year and certainly try to improve on it next year with that underdog in mind.”

As the team prepared to open the second half of a disappointing season, Van Wagenen gave a state-of-the-organization address at Marlins Park and projected an upbeat attitude, even as he admitted the Mets have to “face their reality” and will look to trade players who are impending free agents.

The Mets began play 40-50, trailing the NL East-leading Braves by 13 ½ games. The Mets were also next-to-last in the NL wild-card race, seven games removed from the second position.

Van Wagenen also confirmed a story first reported by The Post last weekend that he threw a chair during a heated meeting with the coaching staff following an emotional loss to the Phillies.

“I was frustrated,” Van Wagenen said. “I think our fans have been frustrated and there was part of me that allowed emotion to come to light and I think emotion sometimes is good because it can rattle the cage to a degree in the attempt to find different ways to yield results.

“My goal when I had the meeting with the coaches before the emotion ramped up was to try something different. It came after another tough loss and I let the emotions get to me. I’m not typically throwing furniture and I am sure our fans have thrown a few remote controls at their TVs throughout the course of the season.”

Van Wagenen’s biggest offseason flub might have been trading prospects Jarred Kelenic and Justin Dunn as part of a deal to obtain Robinson Cano and Edwin Diaz from the Mariners. The 36-year-old Cano entered Friday with a .646 OPS, and with his diminished range at second base evident. Diaz has flopped in the closer’s role, going 1-6 with a 5.50 ERA and four blown saves in 23 chances.

The rookie GM was asked if he regretted making the trade.

“You have to look at where we were and where we are now,” Van Wagenen said. “Bolstering our bullpen was a priority. Bolstering our run production was a priority. We acquired the best closer in the American League last year, we acquired a three-hole hitter that was coming off years or production. I think we have to acknowledge those two players have not performed up to what our expectations were and the onus is on us now to do everything we can to support them to be better and to regain their talent.

“Both players are now healthy. Both players have 72 games in front of them to change the narrative on this season. But as far as grading out, I read a lot of the grades from the offseason and a lot of the grades from midseason and face that truth, but I think our grades are really incomplete at this point because we’re only halfway through the season.”

Van Wagenen credited Mickey Callaway for keeping the clubhouse together during turbulent times and indicated he wouldn’t expect a need to fire the second-year manager. Last month, Van Wagenen axed pitching coach Dave Eiland and bullpen coach Chuck Hernandez.

The GM was given a chance to offer a mea culpa for the season, but passed.

“Any time a team struggles it’s on the organization,” Van Wagenen said. “I think that this organization has provided the baseball operations department a tremendous amount of support, they have given us autonomy to reach a consensus about what baseball moves we think are in the best interests of the organization and then we move forward collectively as one unit.

“I wouldn’t want to put the blame on players or coaches or scouts or anybody of that matter. But I can tell you that this team we built was one of unified vision and it hasn’t worked, so I accept my responsibility in that capacity as well.”