The Mets have never seen Buck Showalter like this.

Showalter was ejected from the Mets’ 7-6 loss to the Reds on Tuesday night in Cincinnati after arguing a call at second base in the bottom of the fifth, his first time getting the heave-ho as the Mets’ manager.

The 66-year-old Showalter got tossed after arguing that Wil Myers interfered with Francisco Lindor at second base as the shortstop attempted to field a grounder.

On the play Myers appeared to grab Lindor’s glove as the ball dropped.

Lindor indicated he wasn’t sure if Myers grabbed his glove, but said the runner should have been called out regardless.

Showalter said there were “about three ways” the umpires could have gotten the call right, but didn’t. TJ Friedl followed with a two-run triple against Nogosek and Jonathan India’s sacrifice fly extended the Reds’ lead to 7-1.

“We had opportunities for the [call at second base] not to matter, but we just didn’t pitch very well,” Showalter said. “Peterson was struggling.”

With the loss, the Amazin’s fell to 17-19.

— Mike Puma contributed to this story