Why do Mexicans slam Taco Bell food?

They say it isn't authentic . Well McDonalds isn't very authentic either but it tastes okay . I know you dont like the cheese and the sour cream and stuff like we do but it is our version of it and I think it's good. I dont need tortillas beat from a rock or sliced beef and junk in it...I want my fake nacho cheese sauce, ground up hamburger and those crispy chips. And a Mountain Dew as well please.