To be fair, Rogue One is extremely popular with fans. Ahsoka is a huge fan favorite. I don't think we can simplify Star Wars backlash as neatly as fans reacting against the existence of a female protagonist. There is some level of that for SURE, but there is also evidence to the contrary when it comes to the fanbase as a whole. Just look at the warm reception Daisy got at Celebration.
What really made a mess of things is that a lot of fans felt, rightly or not, that the sequel trilogy was a systematic attempt to tear down the OT characters and replace them with...Rey, rather than a more traditional passing of the torch to a new group of characters. And while I don't think that was ever the intent, the messy manner in which the ST was created sort of ends up making it feel that way, or least I can see where people get that idea. Especially when it really never managed to execute anything great with Finn. So there's a lopsidedness to Rey's importance that can feel a bit unearned, and then you have stuff like the killing of Han and Luke's treatment. Those things being divisive are so predictable that it's pretty much baked into it, there's no getting around it. But it creates a very tough environment for Rey to "get over", in wrestling terms haha.
Again, that's why I'm hoping this movie can be something great. Rey feels like a character with great potential who was still in development. It might be too late to win over a large portion of disgruntled fans, but I still think there can be an opportunity for the movie to be an overall success if it's genuinely great.