What does it mean to curse an onion?

Swearing at an onion shows that the other person is a simple and stupid person. This stem originally came from Shandong Satellite TV's program "Happy Enqiu". The satirist Yang, who always digress, said that Yang "wish he could eat onions back". Later, according to Li Yuantao's comments, netizens derived the online expression "I hate not eating onions back".