An anti-Israel teen with nearly a million social-media followers raged on TikTok that people need to “support’’ the accused DC Jewish Museum killer, prompting the online giant to take the rare step of quickly yanking the post.

Guy Christensen — a baby-faced, keffiyeh-wearing 19-year-old from Pennsylvania who goes by the online handle “YourFavoriteGuy’’ — doubled down on his online rant to The Post on Friday.

“You will not hear me sympathize with war criminals,’’ Christensen said by phone — referring to the two Israeli Embassy diplomats gunned down by alleged hate-filled anti-Israel assassin Elias Rodriguez.

Christensen — in a TikTok video Thursday that garnered more than 632,500 views before being taken down — said, “I want to urge you first to support Elias’ actions.”

In his video, Christensen added, “I do not condemn the elimination of those two Zionist officials who worked at the Israeli Embassy last night … and here’s why.

“Israel has a live-streamed a genocide to the entire world the last two years,’’ he said.

“You can not expect to do such a thing in this world without the people standing up to fight to stop you in any way they can, to resist against you,’’ said the college freshman, who refused to say where he goes to school.

Asked by The Post if his post could be interpreted as saying he supports the killing of the victims, the teen replied, “I think the only people who are interpreting [that] as such are the people’’ who are using the slayings of “those two Zionist officials … as a pretense to silence critics of Israel.’’

Christensen — who has previously indicated online that he is from Pittsburgh — called the dead man, Yaron Lischinsky, 30, a “war criminal” in the footage, which included a Palestinian flag in the background.

“And the same was true for the woman,’’ he said, referring to Lischinsky’s dead girlfriend and soon-to-be fiancee, Sarah Milgrim, 26.

He meanwhile insisted Rodriguez was “not a terrorist.

“He is a resistance fighter,’’ Christensen said.

Follow The Post’s coverage on Israeli Embassy staffers killed in DC

He added to The Post, “I think it’s very shameful that the media would rather cover Elias Rodriguez over the death of hundreds of Palestinians yesterday.’’

TikTok still had Christensen’s inflammatory video up early Friday afternoon.

A rep said in an email about a half-hour after a Post inquiry about it that the footage was taken down “for violating our Community Guidelines.’’

“We have removed the video that you shared for violating our Community Guidelines,’’ the representative wrote.

“Our Community Guidelines prohibit anyone from promoting violent or hateful actors, and we do not allow conspiracy theories that are violent or hateful, such as denying well-documented violent events.”

Christensen told The Post that his video had been initially taken down by TikTok, then he appealed and won. After it went up again, it was taken down again, and he appealed and succeeded in his bid.

He said it was taken down a third time and that there would be no appeal.