I think you're asking too much of a lighthearted comedy.
The poor behaviour of the men groping Julia etc, does nothing but put those men in a bad light - so the film has precisely the same sensibility as we have now.
Julia is obsessed with getting married - as many young women are, then and now. Everyone has always wanted, and still wants, to be loved (hence the success of so many romantic films where men sweep women off their feet, despite what Mumsnet might think of this). To de
I always thought that, for both Robbie and Julia, it was meeting each other that made them see their previous relationships in a clearer light. The characters' naïveté is what makes the film so charming and, from a plot point of view, makes them prey to selfish partners. Through their relationship, they each become wiser and more self-respecting without damage to their pure hearts, which maintains the light and carefree mood of the film.
It's not meant to be gritty realism. The film was designed as a nostalgia-trip for people who were young in the 80s, and I think for that reason, the rose-tinted spectacles way everything is portrayed is entirely appropriate for the film.