The fact of the matter is that most of us Houston fans have been jibed, ridiculed, and teased for our NFL allegiance for a long time. You get outside Houston and the rest of Texas are Dallas fans. So yeah, to win that way against that team felt good because it was basically a STFU card for a while. Furthermore, the animosity between Dallas and Houston goes deeper than football, and we Houstonians tire of the uppity Dallasites trying to act like they're better than us when they're not. I'll never forget as a child passing through Dallas and stopping at a filling station for the restroom. There was a sign over the toilet that said "Flush twice, Houston needs water".
Football is the one area they've got us, so when we get a chance to tell them to STFU for a while, it's nice. Actually, the best part about that game wasn't that we got to tell them to STFU; it was that we didn't have to. They did it on their own.