Jeff told rachel how IT IS.. rachel cant handle anyone telling her anything.. we saw all that last season with  Ragan  being REAL to her..
 Rachel has outbursts that a spoiled child has.. and she has them over and over again.. and to help her justsify some of these outburst we get brendon.. who privately  berates her..
 Jeff has a dry sense of humor and if you didnt like him the first go around  

 you wont like him the second..  

 who cant resist a man with humor?? .. 
answer: those that dont have one..