Saturday Night Fever: Is the audience supposed to root and feel for this pack of unlikable rapists and A-holes?

I don't get the love for this movie. The main characters are terrible human beings that behave like total scum. I get why people love the music and dance scenes...but the things the "protagonists" say and do...that is some wild shit. I get why other movies like "Once Upon A Time In America" include such scenes, but here it seems a little off. Am I missing something? What do you think?