rag on someone        
phrasal verb with rag verb [ T ]  old-fashioned informal uk/ræɡ/ us/ræɡ/ -gg-
 US拿(某人)开玩笑,取笑(某人) 
to continually laugh at someone or say unkind things about them, either because you are joking or because you want to upset that person
  They've been ragging on me, but it's just in fun. 他们一直在取笑我,但只是开玩笑的。