That's exactly like saying, "I don't shop at American Eagle Outfitters, because I live in a place where real grocery stores are actually easy to find." I will never understand that sentiment, and yet someone is always compelled to say it.
Taco Bell is not Mexican food. It might be Mexican themed, but I don't recall seeing Locos Tacos or chili cheese burritos at Vallejo's or Tres Hermanas. Taco Bell is it's own thing, separate and distinct from real Mexican food. If you want Mexican food, Taco Bell is going to be a major disappointment. But if you want Taco Bell, La Favorita Taqueria is going to make you sad.
P.S. Panda Express isn't real Chinese food, either. But it's damned tasty now and again.