From PerezHilton.com:

Robert Pattinson really respects his elders!

At a December No On H8 comedy show at the Improv in Hollywood, the Twilight dreamboat was rather displeased with a comic's "impression" of the late Heath Ledger, which involved the comedian convulsing on the floor.

Apparently Pattinson and his pals started booing and yelling, "F@!k you! You suck!"

"Leave Heath Ledger alone!"

Yup, too soon.