In almost every fandom I ever had, I liked female characters more (almost, since not all of my fandoms have women in them). Unless a woman canonically try to break canon gay couple (and, in some cases, succeeds) - but my reaction to the guy breaking canon lesbian couple would be just as furious.

>>>Just how many of the people who despise Rose would hate Ryan just as much?

Let's see... If Ryan had a black boyfriend he'd left for the Doctor (who'd treat said boyfriend horribly, by the way)? If his reaction to the Doctor acting a bit melodramatically after being slapped would be "Dont'be so retarded" (since Ryan is supposedly not very straight, "you're so gay" wouldn't sound as bad coming from him)? If the Doctor spend the next season comparing his next companion to Ryan who Would Know what to say and what to do and making said companion feel inferior? If some very vocal Ryan's fangirls continuously bashed the next companion(s) for not being Ryan?
Many would.
People might dislike Rose for the reasons that has nothing to do with her being a girl.
(For the record, I don't want to sleep with the Doctor or with any actor who ever played him, so I hope there won't be any accusations of me being "just jealous".)