exception made of the reptiles, not very different to any Chinese supermarket here, including the lack of sanitary measures
(OK, I'm exaggerating, but not by THAT much)
Anyway, if they don't care, why should we? I've seen places in Mexico, Brazil, Italy, Spain and UK that are just as unsanitary (or more) as that Chinese Walmart. And I like food and cooking TV shows, and every time I see something from Asia (not only China), I fell like "eeew", but it seems it's OK for them, so probably a cultural thing