> I couldn't make out what Paula screamed at Little the first
>time I saw the film but if I'm not mistaken she says "you're
>not a man!" I could be wrong

Pretty sure she said "You're a faggot!"

Which is why Chiron immediately then goes and asks Juan what a faggot is.

This was right after she melted down about him being gay ("are *you* going to tell him why he gets his ass beat everyday?!" or something along those lines).