Not that it matters much since minds are made up, but here is Scalia's account of the incident:
According to other news stories, Scalia actually saying "va' fa' un culo" (which he does not admit to doing) was not part of the original account from the photographer and while others in the area confirm the hand gesture, nobody else heard him say it.
Personally, I still don't care either way. Any more than I did when Bush called a reporter and asshole, Cheney told someone to **** himself, or Clinton got a blowjob.