re: Why do people call them "street tacos"?

Here's an applicalbe, real-world excercise for you to understand why people use the term "street taco".

Do an internet image search for the word "taco" then do another search but include the word "street" in front of "taco".

There will be many discernable differences between the images for the "taco" query including differnt types of tortillas, fillings, and toppings.

The "street taco" (taco callejero) will contain images with more similarities than differences including the tortialla (always soft corn) and the toppings (mostly chopped onion and cilantro.

Personally, I don't like the term street taco and seldom use it but, it is what it is and I don't think one should become so worked up over it's use, especially when their is historical precedence for it's use.