That’s what you get for sticking a first baseman in left field.

The Mets have shown all season they don’t care about defense, and that showed true again in Monday’s 2-1 extra-inning loss to the San Francisco Giants.

In a game when Zack Wheeler played Houdini and tight-roped out of danger on multiple occasions, and the bullpen was tremendous, the Mets were done in on a miscue by acting-outfielder Dominic Smith careening into infielder Amed Rosario.

Here are the happenings.

Right-handed pitcher Tyler Bashlor was wild in the top of the 13th inning with the game knotted up at one and put the go-ahead run on third with zero outs.

Bashlor walked Andrew McCutchen to put runners on the corners, but induced a pop-up from Yonkers native, Joe Panik for out No. 1.

McCutchen swiped second, but the next batter, Buster Posey, tapped one to first baseman Wilmer Flores who fired home and despite an errant throw, was able to get runner Chase d’Arnaud out thanks to a heads-up fielding by Devin Mesoraco.

The scary runner on third and no outs turned into an all-around less threatening, escape-able situation.

Bashlor then got Brandon Crawford to hit a lazy fly ball to shallow left field, which Amed Rosario targeted.

Smith who, let me drive home, is a first baseman by trade, knocked into the shortstop and caused him to drop the ball, while the go-ahead run trotted home to score.

Here’s the bottom line. You cannot stick just anybody in the outfield and expect them to perform.

The ball was Dom’s, and while Rosario likely could have caught it, that doesn’t matter. What matters is that the inexperience Smith has in the outfield is what caused the disaster to occur.

Smith had never played outfield professionally before this year, and the fact that he even had to be stuck out there in the first place shows how deep the organization’s dysfunction runs.

They tried it with Lucas Duda, they tried it with Daniel Murphy, and about a dozen more players in between. It does not work.

You can say whatever you want about Smith being a bust and not living up to the hype. But at the end of the day, the Mets have not exactly put him in a situation to succeed.

If the Mets want to compete next year like they say they do (which, I’m surprised no one’s nose has grown to the proportions of Pinocchio), you can’t pull nonsense like this.

This is not what winning teams do, and it’s part of the reason they are 54-70.

Let’s chalk this one up to another LOLMets moment. Sigh.