It's not that. I wasn't trying to list every pocket of the city that does have good tex mex. The problem is, it doesn't permeate through the city or into the burbs which is my criticism. The fact you counter my isolated example, with another isolated example, proves this point. Most people of middle-upper+ class in Dallas do not seek out this tex mex in those neighborhoods, which means their view of tex mex is shaped mostly by a few large chains.