That was true during the Landry era. The Redskins haven’t fielded many decent teams since then. Other than tossing a funeral wreath into the Cowboys locker room back in those days, the Skins haven’t reached the hoodlum level of Eagles fans. Visiting fans risk assault in Philadelphia nowadays.
The best rivalries are measured in generations, not years. Hence the Bears-Packers games are still a hot ticket even when one or both teams stink, same with Broncos-Raiders.