I think you're dead on with the fatties being loud so that no one will ignore them. Everyone actively ignores and avoids her, so being loud is her only way of forcing people to interact with her.  I have many regular Hispanic customers who don't speak the best English, but even THEY use gestures and words to tell me how much they don't like her. It's pretty funny when they call her "the big/grande one." Haha.  And I hate that you had to smell that disgusting fat at your job. I've worked in a call center and 80% of my coworkers were overweight, most of them obese. The only in shape ones were us college kids and one older lady who was very active and played indoor soccer. The fats, of course, decided we needed to have a potluck lunch every Friday. Mountains of unhealthy food plus chair bound fatties was just a disaster. They smacked their food while on the phone, had greasy keyboards and phones, and I wouldn't DARE sit in one of their stinky, blown out chairs. And of course no one did anything about it because our managers were all the biggest fatties.