“Detainment,” an acclaimed British film about the real-life murder of 2-year-old James Bulger in 1993, has been shortlisted for Oscar consideration. But the late Liverpool lad’s still-mourning parents are not impressed.

“I accept this is a murder of such magnitude it will always be written about and featured in the news but to make a film so ­sympathetic to James’s killers is devastating,” father Ralph Bulger told the Daily Mirror.

Irish filmmaker Vincent Lambe based “Detainment” on police interrogation transcripts of convicted murderers Jon Venables and Robert Thompson, who were 10 years old at the time they abducted and tortured James, who died after an iron bar was used to crush his skull.

Lambe’s acclaimed film won best short film and a special jury award at the 2018 Cannes Lions festival, as well as the grand prix at the Odense film festival in Denmark, which qualified it for Academy Award status.

Now, the boy’s mother, Denise Fergus, is calling for the film to be dropped from Oscar contention. She also accused Lambe of exploiting her family tragedy.

“In my own personal opinion, I think he’s just trying to big his career up. And to do that under someone else’s grief is just unbelievable and unbearable,” Fergus told the hosts of ITV’s “Loose Women.”

The major sticking point for both mourning parents: Lambe never took the time to reach out to them.

“Not once has the maker of this film contacted me or any of James’s family about this film …,” Ralph told the Mirror. “It has been 26 years since my son was taken and murdered and so I have seen many documentaries and news stories about him. But I have never been so cut up and offended by something that shows so little compassion to James and his family.”

After the public backlash, Lambe took to Twitter to plead his case to Denise: He said he “never intended any disrespect by not consulting her” and his film “had not been made for financial gain.”

“This film is in no way sympathetic to the killers and does not attempt to make excuses for their horrendous actions,” Lambe wrote. “There has been criticism that the film ‘humanises’ the killers, but if we cannot accept that they are human beings, we will never begin to understand what could have driven them to commit such a horrific crime. The only way to prevent something similar happening in the future is if we understand the cause of it.”

Thompson and Venables were released from prison in 2001 under new identities. Venables was later convicted of child pornography offenses and spent from 2010 to 2013 in prison. He returned to prison in 2018 after pleading guilty to possession child porn.