WARNING GRAPHIC CONTENT. He was knocked the f**k out! While performing in San Diego, rapper XXXTentacion was viciously sucker punched and knocked out cold! Repoertedly the culprit was stabbed and beaten to a pulp! XXXTentacion says the guy who knocked him out at his San Diego show is just jealous of his success ... the 19-year-old believes there's NO reason to hire more bodyguards.