This place has turned to crap over the last couple months. I use to go there for a sandwich regularly when I didn't feel like eating much or cooking because of its close proximity....the staff has become ghetto. There are a couple lingerers there still but even the managers I've seen (especially the pot-bellied dirty white man in his 20's/30's) are a-holes.
If you don't want to be overly nice, just don't be! Just don't be blatantly fake with your interactions with your customers. Its clear these folks are on a downward spiral. I wouldn't trust the food safety at this point.