Su is also good at Chinese Traditional Medicine (YangSheng) and 'PaoJiao" is from him since he thought this way is good for health and did lot (he walked lot and feet were painful/bad).
@3'30", Su talked about dogs and 'Dogs' mean 'dogs' since he eats bones so dogs have no bones to eat, so dogs don;t like him and this way of cooking/eating. He was kind of teasing himself to compete food/bones with dogs. Nothing about other people/officials.