If you have a disability, are from a BAME background, come from a working class background or go through any illness Oxbridge is not the place for you.
Don't presume to speak for all of us. I'm from a working class background and can assure you it most certainly was the place for me.
That's not to say there are no problems. The complaints you make about sexual assault minimisation are ones I've heard before. Not while I was there, but from people who've been there since. I believe them, as I believe you. I felt incredibly safe there but a lot goes on trust, and you only need one person to start abusing that and you have a massive problem.
You should not, however, lump all the groups you mentioned in together. The sexual assault minimisation you mention is likely to be more of an issue for wealthy women students than it is for working class men. Being white working class, any racism that might be there wasn't something I had to deal with. Etc etc.
In answer to the learning difficulties question, I had one friend with dyspraxia and one with dyslexia (who did get kicked out, to be fair). I also had a friend who was a grad when I was an undergrad who was incredibly dyslexic, had a huge amount of help because he could barely read and write- may be the same person mentioned above actually. He was a bit famous, had gone to Cambridge a few years early, and clearly the environment suited him very well. One of the cleverest people I've ever met, and when he sent me a good luck card before my exams it looked like a 5 year old had written it. His LDs were pretty severe I think.