At McDonalds I politely asked three times for spicy chicken nuggets and got plain. Why do fast food places constantly fuck up my order?

I once ordered an egg mcmuffin and just got a plain English muffin. No matter the chain, my order gets messed up.

I refuse to complain out if fear of my food being fucked with. I know fast food workers are typically teenagers or degenerates, but it seems like they would have a better safety net for stupidity.