I had a friend who was a health inspector in the Dallas area. One particular distributor supplied the meat for every Chinese restaurant in town.
Once, he found a shipment of shrimp with too much bacteria and told them they had to throw it out. He went back the next day to see if they did it, and found them mixing the bad shrimp with good to get it to pass inspection.
He was going to shut them down, but his boss overruled him. Shutting down the distributor would have shut down every Chinese restaurant in North Texas.
That kind of thing happens with many other restuarants, not just Chinese. I walked through a kitchen at a relatively decent restaurant while planning a wedding for my daughter. I almost barfed at what the owner called clean. Needless to say we didn't select that place.
As far as Guangxi, yes they eat odd things. My Chinese instructor tells us of local dishes from Guangxi and Guangzhou in particular. Some she wouldn't touch and she grew up in China.
I guess that would go for a person from one area in the US when moving to another. Take the Zweigles white hot, they a loved were I live but many visitor think they are spoiled hotdogs.