Kentucky fried chicken..... After a worker there told a little girl who just got out of the hospital from being mauled by a dog and her grandma that they needed to leave because the little girls face was scaring the customers! (I hated KFC anyways but still.... Now I have an even BETTER reason for boycotting them.)
Zoos and circuses that keep caged animals for entertainment.
Red Lobster. I got food poisoning there once and then after talking to people who worked for them and someone who delivered food to them, I will never go back.
ASDA (the UK branch of Wal*mart) after they fined a member of my family £50 for overstaying in their car park.
Since I used to spend several thousand pounds in there every year, I'm pleased to say that their petty theft has actually cost them, over the last few years, many times what they stole from us.
They won't care of course, they have many other customers.
A deeply hateful company.
McDonalds and Walmart.
Chipolte food places. I love Mexican food but after all the food poisoning and other complaints? You couldn't pay me to eat anything from there.