I said in my 25 years of being a Raider fan I've never met one Raider fan in person outside of this one single internet forum that cared about the Niners. Even on this internet forum out of the 15 or so active Raider fans, only like 5 of them talk shit and it's mostly just back and forth between the same 5 Raider fans and the same 5 9er fans.
I personally knew some Niner fans that were rooting for the Raiders in the Superbowl back in 2003 and some Raider fans rooting for the Niners last year.
This forum is literally the one time in my 25 years of being a Raider fan that I've witnessed some supposed "rivalry" existing between the two teams.