Don’t both teams have to be competitive over a historical period of time to call it a rivalry. Isn’t it more Rangers fans are jealous of the Astros success?
I lived in San Diego in the Eighties for a couple of years. Padres fans thought they had a rivalry with the Dodgers and reveled in any victory. I lived in LA for years. Dodger fans saw San Diego as a team they just beat on a regular basis. I believe what really ticked off Padre fans was how many Dodger fans would be in the stands in San Diego.
Go to San Francisco and talk up the Dodgers. Now that’s a rivalry! Ask Johnny Roseboro.
I was raised on Red Sox-Yankees. Even living in Southern CA didn’t change the intensity. There were plenty of ex NYers in LA.
I was saved from the dark side at age seven. We lived in Connecticut. The Yankees were always winning. The Sox sucked. I was a Yankee fan until we moved to Massachusetts in 1962. Yaz, then Tony C, then Boomer, then 1967 flipped me. My first live baseball game was in 1961. My grandparents took me to see the Yankees with Mantle and Maris chasing the home run record play in Fenway Park.
Makes me feel like a schmuck the first game I took my daughter to was the Phillies-Marlins at the Vet (a dump). My son’s first game was also at the Vet. But it was Schilling versus Brown (Phillies-Dodgers)