It is representative of texmex in the same way mcdonald’s is representative of a burger or a slim jim is representative of beef jerky. Although, funny enough, there is a much bigger focus on beans over meat (which is why taco bell is actually a decent fast food option if you are vegetarian but don’t mind trace amounts of animal products).
But in terms of marketing and racists talking about how it gives them the shits (which is also related to “ethnic” food), it is categorized as “mexican”.