FFF. Fast Fun Friendly. I'm a naturally neutral/downer person and they've been bitching about me bringing the mood down with my eternal frown/scowl. I can't fake happy well.
git gud scrub.
I've honestly never heard of this FFF stuff before lol.
And you're a cart attendant, you only have to interact with people for maybe 5 minutes for a whole day, why no smile or at least a cheery voice?