I work at one of those famous coffee shops, I'm one of the best barista's in all of California imo, sometimes I have to make over 100 drinks an hour, and guess what, I make mistakes sometimes, there not always my fault, but it happens. NOBODY IS PERFECT. Nobody is going to get it right 100% of the time, mistakes happen, everywhere, all the time, and you can handle it like a respectful adult, or make yourself feel better by talking down to the "simpleton" behind the counter.
I understand applying for a job, and giving it your all. That's a pretty simple concept. I also understand that there are going to be shit employees in ANY line of work, but when it comes down to it, we are all human beings, and we all deserve to be treated with the same amount of respect, weather we are killing terrorists or flipping burgers it doesn't make a difference, we all want to be treated the same, and clearly there are a lot of you that DON'T respect people in the food industry.
All in all, getting your order fucked up at tacobell means absolute SHIT in the long run, sure everyone want's it right all the time, but sometimes life throws you a curveball, and its all about how you handle it, some people strike out, and some people know just what do with it.
Also, nobody's riding the high horse at a fuckin' McDonalds.