Yeah, my recollection is that Giovanni attempts to be blasé about David's relationship with Hella, but deep down he is incredibly jealous and possessive. This is fueled not only by his insistence that one is either gay or straight, no in-between, but also his status as "the other woman." No doubt, Giovanni is a very flawed and complex character. But while his comments are certainly misogynistic, I think his crime is bisexual erasure, not true-blue misogyny.

It's been awhile since I read Giovanni's Room, but I'll give my take. Giovanni doesn't hate women, he hates heteronormativity. And in this sense, his comments aren't attacking women but are instead underhanded jabs at David's perceived bisexual fence-sitting. His underlying emotions can be translated as "Can't you see we don't need women?!? We just need each other! Please, David...Just accept that you're gay."