The company you keep at your place of work is a seperate issue to the company you work for.
There have been inmates of Nazi concentration camps who found camaraderie, companionship and created lifelong friendships among fellow inmates during their incarceration. Using your logic, this would seem to imply that Dachau was a fine place.
Whether you work with your current workmates in Maccas or as prison guards or as zoo-keepers or in an orphans homw, they would be your friends because they are the people they are. The corporation just happens to be the place you are around these good people.
The McDonalds corporation is a terrifying example of rapacious capital at its worst. Your friends are the finest examples of your friends. These two issues are mutually inclusive...