Twitter users raked Democratic presidential candidate Pete Buttigieg over the coals Monday over an old photo of him posing at the Holocaust Memorial in Berlin and posted by his husband with the caption, “This guy.”

The photo, taken in April 2017, and posted to Instagram by Chasten Buttigieg, shows the South Bend, Indiana, mayor standing in the middle of the memorial and looking back over his shoulder at the camera.

One person wrote: “Only a stone cold psychopath makes the holocaust memorial about his adorable relationship. Shame on you.”

“’This guy’ instagramming at the holocaust memorial has some explaining to do,” added Taurus Lynn, a self-described backer of Beto O’Rourke.

“Boo is looking so cute here at the Memorial to the Murdered Jews of Europe,” mocked another poster.

It was unclear how the old photo — shot about 20 months before the decorated Afghan war veteran announced his presidential bid — resurfaced over the weekend, but it sparked outrage on social media.

“LMAOOO the Chasten Buttigieg Instagram post of Pete at the Holocaust Memorial in Berlin is actually f–king real. The caption is ‘This guy.’ F–k these goys,” tweeted Molly Weinstein.

“What kind of bulls–t is this? Pete Buttigieg poses for a campaign photo at the Holocaust Memorial? This man is sick!” tweeted Engage Your Brain, a self-described fan of President Trump.

Buttigieg is not the first well-known person to draw ire over photos taken at the Berlin memorial. Singer Pink, who is Jewish, in July defended her two young kids from online backlash after sharing a photo of them running through the Holocaust Memorial.