This is painful..

Robert Downey Jr. was on the UK's Channel 4 News recently when the Marvel's Avengers: Age of Ultron star was taken aback by interviewer Krishnan Guru-Murthy's uncomfortable line of questioning. (You can skip to about 3:50 in the video or catch the highlights above.)

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The trouble starts when Krishnan asks the 50-year-old actor about a quote he gave The New York Times regarding his political beliefs after going to prison.

"You can't go from a $2,000-a-night suite at La Mirage to a penitentiary and really understand it and come out a liberal," Downey Jr. told The Times, of which Krishnan referenced.

After the actor politely answers that he is unable to speak to a quote he gave years ago, he asks, "Are we promoting a movie?"

That's when Krishnan and Robert dance around for awhile longer before Krishnan finally asks Downy Jr. about his father, and the "dark period" in his life.

So naturally, the Iron Man star asked what was going on in this interview.

Keep in mind, he is promoting a super-hero movie, and most of his press has basically gone like this:

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Ultimately, Robert Downey Jr. walks out of the interview.

Fans were very quick to defend Robert, and call out Krishnan's line of questioning.

This is actually not the first time Krishnan has conducted a train wreck of a chat. Watch him piss off Quentin Tarantino during a press interview for Django Unchained. (The "fun" starts at around the 1-minute mark and really heats up at 4:30.)

Marvel's Avengers: Age of Ultron premieres May 1.

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Do you think Krishnan was in the wrong? State your case in the comments and tweet #ETnow.