Well, Sid DOES pwn. You're correct about that. But...the "joke" is that he hardly knew how to play the bass at all--or any other instrument for that matter. His amp was often unplugged during concerts () and Jones recorded the bass parts for the albums.

'In his time with the Sex Pistols, Sid was renowned for his lack of ability to play the bass. When Sex Pistols guitarist Steve Jones was asked why he instead of Vicious recorded the bass parts of Never Mind The Bollocks, Jones responded "Sid was in a hospital with hepatitis so he couldn't really play, not that he could play anyway". At times during performances, other band members would unplug Sid's bass because his playing was so bad. [3] Lemmy, the bassist of Motörhead, was asked by Sid to teach him how to play bass with the words, "I can't play bass," to which Lemmy replied "I know." In another interview Lemmy stated "Yeah. It was all uphill. And he still couldn't play bass when he died." [-wiki]

"When Sid joined he couldn't play guitar but his craziness fit into the structure of the band. He was the knight in shining armour with a giant fist."[27] Lydon later recalled: "The first rehearsals with Sid were hellish. Everyone agreed he had the look. Sid tried real hard... but boy, he couldn't play bass."[11] [-wiki]