To no one in particular,
Are all these relationship issues not just down to compatibility?
Both people in the relationship are responsible for the relationship. You can't just say, "Well, I'm the normal one. You're the one with the disability, therefore it's up to you to manage your autism so it doesn't affect our relationship." That is wrong, ignorant and, yes, ableist. It's horrifying to see that these relationship issues are being blamed on autism, and therefore on the person with the autism.
Plenty of autistic people have happy, loving relationships. Not because they are less autistic or differently autistic, but because their partners are the right fit for them, just as they are the right fit for their partners. You can't blame autism for why your partner makes you unhappy. You're unhappy because he is not the person you want him to be. He is not what you need. There is no point in thinking, "If my partner didn't have autism, he would be able to respond to my needs." Well, yeah, and if I was grey and had a trunk, I would be an elephant. It's irrelevant. We are who we are. It has nothing to do with autism.
But obviously it is easier to deflect your joint incompatibility issues onto a disability/condition, and therefore the person with the disability/condition, (because you believe ND is the "inferior" ability?), rather than accept that you are equally responsible for why the relationship doesn't work well. This way, you get to be the "victim", the innocent party, and are allowed, supported and encourage to openly tear into autism and promote ableism by stealth.