A fed-up patron at a British pizza joint punched a vegan activist in the face after animal rights demonstrators stormed into the eatery — with the whole debacle caught on video.

Footage of the Sunday night confrontation at Pizza Express in Brighton shows more than a half-dozen activists marching in single file, holding signs and shouting slogans as they block the counter.

The unidentified attacker confronts the group, angrily telling them to leave and pointing to the door, according to the video, posted by the Daily Mail on Monday.

When they don’t comply, he clocks one women in the face. He then glares at the camera as employees attempt to calm him down.

Undeterred, the activists continue to shout slogans — “Animals want to live. Animals feel pain” and “It’s not food. It’s violence” — before finally leaving in single file.

The video made its rounds on social media Monday.